Malicious PDF — malware analysis report

Static analysis result for SHA-256 19acb6564f6775fb…

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 13:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f6f91e0c7ca84eeda7843dc5e873825 SHA-1: bf6edefb68530522345583b100580ab4cf3b25e8 SHA-256: 19acb6564f6775fbfbdd92464485c943757c0708b429baf225ef502ddcb490a3
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, ttraff.com, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains text related to alcoholism and the World Health Organization, suggesting a lure. The presence of numerous embedded links to external PDFs, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for the malicious redirector. No scripts were extracted, but the PDF structure itself facilitates 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.com/wix?keyword=alcoholismo+segun+la+organizacion+mundial+de+la+salud
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6154/2045/files/17384136556.pdf
    • https://cdn.shopify.com/s/files/1/0437/3702/2615/files/10941686403.pdf
    • https://cdn.shopify.com/s/files/1/0448/0414/5309/files/aflatoon_history_in_urdu.pdf
    • https://static.usrfiles.com/ugd/b8c837_964dd730ac994cffbda67c091e7c80a6.pdf
    • https://static.usrfiles.com/ugd/9e41f0_769dc3c5d57d4dc98f331d867f2ba143.pdf
    • https://static.usrfiles.com/ugd/b8c837_9af3265543474d41b4bdf191b94d007a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd07f6ef87b340d2a6c5b276204ea7e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_91e22bda275a4488aca5667fd10a698b.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fa55fd9c92a4cde8dddfc539b5e5b1c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e219497cafd84df0b95eed4f89dc739b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3803c81a9ee94d22b9525ee52f038ba7.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa195beb4c9541e6adc9809bf22f400e.pdf
    • https://static.usrfiles.com/ugd/8e1900_7364473806ee4a8da4036bd84f1c13e4.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/calistenia_treino_completo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5864/2595/files/least_common_denominator_calculator_with_variables.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/35173423116.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000616a.bin
04a9f3026a0e280e14c40efe2a329727b910411ce7289a26eacec24d8ed77bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616A 5392 bytes
font_01_sfnt_off00007393.bin
a0cb22766d4266596eb93ec2bfc10f57a45ec82478afa248e68e2d0ef5562035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7393 11296 bytes

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