Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3371c3350958f0…

MALICIOUS

PDF

75.8 KB Created: 2021-01-11 08:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 695d9d5d06d57a010f3254cf0ca94cd5 SHA-1: 71bd01b01482e2e5466b47f2469d47912f138b24 SHA-256: 7f3371c3350958f0224d822944aa3d49189360fd112dbd3f34661bc25072037d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, disguised as search results for "auto chess tier list android". The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/aws?utm_term=auto+chess+tier+list+android In PDF document text
    • https://site-1168133.mozfiles.com/files/1168133/map_marker_icon_copy_paste.pdfIn PDF document text
    • https://mumamelif.weebly.com/uploads/1/3/4/4/134464597/wosepokepoxugos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5ff2810454ad2.pdfIn PDF document text
    • https://site-1190022.mozfiles.com/files/1190022/lobojuxisaguriwujab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5fe7e89b229db.pdfIn PDF document text
    • https://site-1178518.mozfiles.com/files/1178518/brothers_in_arms_3_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5f8e666462715.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/0jazw0f/sakelixe.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/9349803.pdfIn PDF document text
    • https://dapalaboz.weebly.com/uploads/1/3/0/8/130874192/xefenemifobemo.pdfIn PDF document text
    • https://site-1172347.mozfiles.com/files/1172347/zedekazet.pdfIn PDF document text
    • https://rukudigef.weebly.com/uploads/1/3/4/6/134642400/ea83f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_5fc05937442d3.pdfIn PDF document text
    • https://cdn.sqhk.co/salusasopuvi/7iiZ1Bc/the_viking_treasure_hunter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetituri/54187805570.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/musixujovulepib.pdfIn 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_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 5016 bytes
SHA-256: a425cc2fb756accce9c26dbc160e50c9c2f9fed90982cd47d56fe637e11ca158
font_01_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 10120 bytes
SHA-256: c86d149ed1dfec249f1dcda95d3449dc76fd0fe43338256eb2f5294d63672baa

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