Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be771fff3fbf0be…

MALICIOUS

PDF

104.3 KB Created: 2021-04-26 19:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ed4aab03876cc80edc68a58c6fe5454c SHA-1: 9a69835992cbf82466650c6fb8b3f880dab46630 SHA-256: 5be771fff3fbf0be3cdfc9500bc7c4c2c0ab8c2443732ef454e33be2671b8bc0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm. One prominent link directs to 'https://yafferge.ru/strik?utm_term=roomba+charging+light+flashing+fast', suggesting a lure related to Roomba devices. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm its nature as a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=roomba+charging+light+flashing+fast In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_5fe74ca696cb6.pdfIn PDF document text
    • http://nodefiw.medianewsonline.com/absalom_and_achitophel_line_by_line_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/hgpgjic/46883115975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_6039d87550d21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386597/normal_5feb783301212.pdfIn PDF document text
    • http://ritual-venki.online/what_are_three_basic_functions_of_every_accounting_systemq4otq.pdfIn PDF document text
    • https://cdn.sqhk.co/nokodexuxof/iejbyRj/nccn_guidelines_for_patients_ovarian_cancer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455176/normal_606648cba56ee.pdfIn PDF document text
    • http://sberin.xyz/96233202581jzrpg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_603c4b4051f98.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/hfjbidt/didier_drogba_chelsea_legend.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/8hgCvb9/wolepijazuvuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_6028ef1838729.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/bestselling_novels.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_604ab738cd7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_605beec953c51.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_6025a97bbd994.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/storyboard_pro_free_trial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_602a3da9a6520.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/what_are_the_names_of_the_first_20_elements.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_aebb313007d8457ca6a2641d601bb42d.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_6235a2d0b280491e8acb9c15dff87b59.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_0638fc08d8184c7a9d73c194f1c3242d.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DA 5444 bytes
SHA-256: a6e01c486c386e13a8512b2c45b7a7068ee97558560899aa26e973fc07f9d2c9
font_01_sfnt_off0001583a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583A 11016 bytes
SHA-256: fa3d11e0a11c535fe5fff546e0f04c5f71470413ba54021484e99fb66e7ef34c
font_02_sfnt_off00017dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DBD 16232 bytes
SHA-256: e1fcaa290bc8b5aed85f312864440120c61db6abd2add9737883d56687aaee62

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