Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d2373787842830…

MALICIOUS

PDF

36.4 KB Created: 2020-09-18 20:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 122adb4bf5d3ca90e891a5fbab8b4608 SHA-1: 991d2363ba895fa1239e1d66f008da4c3418ced2 SHA-256: 74d23737878428309d17375449bee03fc0b90cf074c187e579ee2a298d126f25
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious infrastructure. The primary malicious URL identified is https://ttraff.club/wix?keyword=lewis+and+clark+reading+comprehension+worksheet+pdf, which is flagged as a malicious redirector. The document's content, though obfuscated, appears to be a lure related to educational material to encourage clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ttraff.club/wix?keyword=lewis+and+clark+reading+comprehension+worksheet+pdf
    • http://files.gcontrols.com/uploads/1/3/1/6/131606694/5696077.pdf
    • http://files.roberto-quaglia.com/uploads/1/3/1/6/131606059/lalaso.pdf
    • http://files.jazzwealth.com/uploads/1/3/0/9/130969761/6488194.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://615e4626-6e98-4809-8500-1105888b8c2c.filesusr.com/ugd/a01749_5385cf86c1114694bd5988caeb008d97.pdf?index=true
    • https://e3c48057-b5a9-4f35-9a61-f92be43d97bd.filesusr.com/ugd/7c30af_a82e1b73b5884d65af0836869686b8d8.pdf?index=true
    • https://50aded92-d8c7-4f2f-93f2-0b82c89b3738.filesusr.com/ugd/89064d_84e0763fdf2f4ff6999f666c024b90fa.pdf?index=true
    • https://9680c711-62d4-4631-9c5f-24f8690f1cb0.filesusr.com/ugd/1b0481_b2760381a22546878151654c0df3723a.pdf?index=true
    • https://b1b54d73-0adf-471e-8f08-7ca1a22f0ff5.filesusr.com/ugd/cf14a4_be6fd50775494f88815b5d9affbde8ec.pdf?index=true
    • https://af72642b-a336-4ff3-813f-fe8ef80a8acc.filesusr.com/ugd/cf14a4_2739278c58e64c04a27662ea32e37d90.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/6862/8892/files/11382776477.pdf
    • https://cdn.shopify.com/s/files/1/0436/4327/3369/files/food_and_beverage_industry_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/group_1_elements_alkali_metals.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/87055383686.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/4t65e_transmission_diagram.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d91.bin
b9cae2d8c4aa6f0d63085fc7c047a47e1ca065da367922943fa6cfda6cb1d29e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D91 5664 bytes
font_01_sfnt_off000060c7.bin
56d41d524a20405633805a757e167946e5cabb6da232a2ac40c245cb9f38528c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C7 10480 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.