Malicious PDF — malware analysis report

Static analysis result for SHA-256 76eb37d2755d0821…

MALICIOUS

PDF

48.4 KB Created: 2020-08-21 21:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53fff9459d6ad511b2aef1a92cd9fa0c SHA-1: 085a8a551444b31a5c6e7318dce9484097d477af SHA-256: 76eb37d2755d0821581192cd2a0db4ea3997ca42248f1693a42f71618c9c186b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary redirector URL, https://ttraff.com/pify?keyword=atmosfearfx+zombie+invasion+free, is flagged as malicious. This suggests the document is part of a link farm or SEO poisoning scheme to drive traffic to malicious sites. No scripts were extracted, and the document body is heavily obfuscated.

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.com/pify?keyword=atmosfearfx+zombie+invasion+free
    • http://files.lisaspykers.com/uploads/1/3/1/4/131408027/5927737.pdf
    • http://malejilu.vanessakeel.com/uploads/1/3/0/7/130739885/rikotemuv_sixikusuno.pdf
    • http://lelutuj.ahmedal-azzawi.net/uploads/1/3/1/4/131482975/bikefenatufel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/7029/9048/files/kimosaboluwulutevowu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5227/6632/files/aesculus_flava_fact_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/31938570888.pdf
    • https://cdn.shopify.com/s/files/1/0434/7176/5664/files/4th_industrial_revolution.pdf
    • https://cdn.shopify.com/s/files/1/0440/6706/1925/files/tozudedajus.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7134/files/alkyd_resin_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/2911/8627/files/90311457671.pdf
    • https://cdn.shopify.com/s/files/1/0438/9886/3771/files/charge_of_the_light_brigade_poem_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0443/1849/0780/files/pubusezepojegetozojepam.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/final_fantasy_tactics_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/4068/3685/files/nys_power_of_attorney_form_2016.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005492.bin
3f298fea094f0b2a415693dabe7fc7d1828a2db7651b93bd00c6d8eb01e42a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5492 5996 bytes
font_01_sfnt_off000068da.bin
94f0d4fbff06f25c0789305d79923c1e3b8eb33e3bbd79a28854dd638f3a38f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DA 4976 bytes
font_02_sfnt_off000079b6.bin
4200e54ddde86cf7a7f5e10644c53872906d0bbe085affda9682f9dfd4378a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B6 14076 bytes
font_03_sfnt_off0000a5ef.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5EF 4324 bytes

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