Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f8c4c9deab7dd4…

MALICIOUS

PDF

67.5 KB Created: 2020-10-19 00:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4e5565228dae22b710afebdfefdbcea SHA-1: 93d38310bf426dcf32a8844df45da49042d02741 SHA-256: a4f8c4c9deab7dd45d96e45122b1bd9d75860db39728fd5bafc84fde122531ee
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a strong indicator of malicious intent. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of a large number of external PDF links also points to a link farm or spamming operation. No scripts were extracted, but the PDF structure itself facilitated the malicious redirection.

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.club/123?keyword=persuasive+language+ethos+pathos+logos+worksheet+answers
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/rexanebatuwig-juledip-zekuvorukuruv.pdf
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/wuxefugujat.pdf
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/1342199.pdf
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f8bd8873264f.pdf
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5f89dec8b7b52.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f895a75da9e9.pdf
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8a9d0b9bbfb.pdf
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f8b4f4da5fc3.pdf
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5f8a8bdf1b0e8.pdf
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f87059cbff7a.pdf
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5f8bf455bb332.pdf
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f8885f2c8630.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/632ec6cf-04c8-4154-9b18-2e9b7be048e3/titawobadavegomaretis.pdf
    • https://uploads.strikinglycdn.com/files/29fe6a3b-9a9b-4d95-87a9-f123dd859788/79832303414.pdf
    • https://uploads.strikinglycdn.com/files/c1266087-305e-4042-9f1c-30d52c0665f9/19607848028.pdf
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/bump_set_spike_shirt.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7848/files/92165656044.pdf
    • https://cdn.shopify.com/s/files/1/0435/8147/2929/files/afk_arena_codes_may_2020.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_off0000bf21.bin
3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF21 2828 bytes
font_01_sfnt_off0000c91c.bin
d452c8b5a7b611162f474324220a0788105986991e92face08679908b7d303ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91C 5300 bytes
font_02_sfnt_off0000db2c.bin
4f0a2f9efbdb19ec0aec0f36f9a7b400c64eb0b17777fbefec3a16cdd6abef05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 10008 bytes

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