Malicious PDF — malware analysis report

Static analysis result for SHA-256 a629b3b5aecf3246…

MALICIOUS

PDF

89.8 KB Created: 2021-02-16 12:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 871e5b245c913950632f28bbaecbd836 SHA-1: c25d05f9e151c3ff4caaf0b78e7e94374afac8f1 SHA-256: a629b3b5aecf3246f284cd3603872eb88fadfe23c27e0020b6a06c62f72e1609
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to cost inquiries, likely to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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 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=cost+to+replace+an+ipod+touch+screen In PDF document text
    • https://cdn.sqhk.co/rowemarul/ohcBGia/55704122719.pdfIn PDF document text
    • http://nasty666.space/grocery_pallets_wholesalepbun4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411511/normal_5ff604b911c63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420765/normal_5ff3943f7b7f6.pdfIn PDF document text
    • http://shlifovka-pol.website/the_story_of_god_bible_commentary_genesishfny0.pdfIn PDF document text
    • http://4338bacchus.com/67957465269qtlqr.pdfIn PDF document text
    • http://passive-income.ru/baboduranojemitopmih5.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/Xihf1PF/gujufivanovit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_60240c6a4dc48.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/fjdhhhe/mens_hairstyles_medium_sides_long_top.pdfIn PDF document text
    • http://blu-ital.space/4384880895ake79.pdfIn PDF document text
    • http://espaceabonne.com/gamers_wallpaper_for_pcr2ob4.pdfIn PDF document text
    • https://cdn.sqhk.co/pugijuzo/giidxrZ/dinosaur_bounce_house_rental_ct.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/jXjaNgc/wisiz.pdfIn PDF document text
    • http://rezotu.xyz/disney_crossy_road_jugar_online3492x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 8520 bytes
SHA-256: 9e6ea5d9e543767bb349ea9d52e4a7f964d7afd81a3eacd4b7cd708a961d2d15
font_01_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 5064 bytes
SHA-256: 1ed3fd1b48bed4a2a6859e7df99f80c3ae4426560b7f1f4f1f24ef60db97aa52
font_02_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 10992 bytes
SHA-256: 26c1b3a45f9042f5465bba9944389ba27c3640cfb9751dc6d92f622ed03591ab

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