Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f61069fc17c124…

MALICIOUS

PDF

38.4 KB Created: 2020-08-07 09:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 960619a7f3d1046074f6ff9647f6188d SHA-1: 89f0e990c876bd7676b90f3a7c610146fbcd4a25 SHA-256: 70f61069fc17c124567ba18aaa92a62308ef9ff9d67af0870eb54c965de05d71
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by a machine learning classifier and contains a large number of external links, many of which point to potentially malicious redirector infrastructure. The presence of numerous links suggests an attempt to manipulate search engine rankings or to distribute malware through a link farm. The document body itself is heavily obfuscated and contains embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 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.
  • 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.cc/pify?keyword=annabel+lee+test+pdf
    • http://files.busterguru.com/uploads/1/3/2/6/132683173/fevesowewajixo.pdf
    • http://files.vetsourcecanada.com/uploads/1/3/0/8/130873708/9817695.pdf
    • http://files.manestreethaircompany.com/uploads/1/3/1/4/131409274/b41fbfe.pdf
    • http://files.bpesfoundation.org/uploads/1/3/0/7/130775635/pagokafexaxita.pdf
    • http://files.dynasecprotection.com/uploads/1/3/0/7/130740477/lujegibijo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/6187/9719/files/how_to_attach_file_in_iphone_email_reply.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/autoestima_alta_negativa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/68146415009.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6797/files/92139187099.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8988/files/games_for_windows_xp.pdf
    • https://cdn.shopify.com/s/files/1/0449/7352/3112/files/el_budismo_moderno.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/fincen_form_105.pdf
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/buzisosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/sistema_bethesda_para_informar_citologia_cervical_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/9001/6424/files/kuwixosunusatikodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/fiwodofizomoporemepapekog.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/classifying_2d_shapes_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c9d.bin
7f2ed6c1febfe7023da65c6afae62cd14a1c713692d3d37ab8133f0837ab12de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C9D 4696 bytes
font_01_sfnt_off00005c95.bin
ec06dce121d733dba57509e407d7b63b52836a20fcc729dda9992fbb0c527572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C95 9992 bytes
font_02_sfnt_off00007ebc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBC 4324 bytes

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