Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f34fe1a893370e9…

MALICIOUS

PDF

41.4 KB Created: 2020-08-01 22:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 792f4a6aa6f2ae4eb9e664ddadaf5ccc SHA-1: 323e6dbdc523dc9ce2d333238c4a756834412892 SHA-256: 5f34fe1a893370e92e644ebca5441fbf73089185e10ded0ffe59c70479792575
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.ru/pify?keyword=triphasic+bbt+chart', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and contains the malicious URL, further supporting the malicious intent.

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.ru/pify?keyword=triphasic+bbt+chart
    • http://files.karynlim.com/uploads/1/3/1/4/131453221/duxaxolizidopi-gulotoxomef-sodifivegegowe.pdf
    • http://files.africanpromiseexp.com/uploads/1/3/1/4/131407135/deramidokuk-pifomekutuzup-fipavisotizawol-tovowepedoru.pdf
    • http://files.jennaleeneff.com/uploads/1/3/0/8/130813846/navalifusijazolunu.pdf
    • http://files.cogpowcommunity.org/uploads/1/3/0/7/130740571/6759650.pdf
    • http://files.ahealthieryou.shop/uploads/1/3/0/7/130776655/b07e5c3cf97df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45251784546.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/40843480860.pdf
    • https://cdn.shopify.com/s/files/1/0437/8643/6759/files/jedog.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2677/files/28685758822.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/notexunosude.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dewubi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/raputefigobagaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/47817759196.pdf
    • https://cdn.shopify.com/s/files/1/0435/2793/0011/files/github_overwrite_local.pdf
    • https://cdn.shopify.com/s/files/1/0432/9478/5694/files/91747674274.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/11161099405.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/67011767140.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_off000063d2.bin
23a0d3bf1ca603a19451951f7e304a89e97afa3f4bfac312f9bf434cc6a11522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D2 5076 bytes
font_01_sfnt_off00007507.bin
b075531426e350c31d963b991ea4bea19d3ed29d10a7d7302306087bff7cfa9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7507 10852 bytes

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