Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d409f7da7736a3a…

MALICIOUS

PDF

43.9 KB Created: 2020-08-14 12:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e3198eff597f056ec72410c292c2e75 SHA-1: 656b11f362e803833a77aed5fa2929530af4cf1b SHA-256: 5d409f7da7736a3a56ad459ffc0cc47a0671d362faa3fbf77fc7ba0ddd9f1f29
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for malicious redirector links, specifically pointing to 'ttraff.ru'. The document body also contains the same URL, presented as a lure for updating Android Studio. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm used to distribute malicious content or for SEO manipulation. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=update+android+emulator+android+studio
    • http://files.heritagefireequipment.com/uploads/1/3/1/8/131856860/aee0e.pdf
    • http://susezo.midwestschoolofastrology.com/uploads/1/3/0/9/130969440/fc264d.pdf
    • http://files.austinguineapigrescue.com/uploads/1/3/0/7/130775921/nipetijigix.pdf
    • http://files.jenidahn.com/uploads/1/3/1/4/131453365/29153ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/dixiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/5361600077.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/vegexatekuvap.pdf
    • https://cdn.shopify.com/s/files/1/0435/4369/1413/files/leaders_are_born_and_not_made_discuss.pdf
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/sokuvoxorituvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7185/files/windows_10_without_media_creation_tool.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/fusionner_deux_avec_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6166/files/genestealer_cult_codex_2020.pdf
    • https://cdn.shopify.com/s/files/1/0445/6284/1759/files/basic_computer_training_file.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/lewenafumivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/mathematics_std_10.pdf
    • https://cdn.shopify.com/s/files/1/0446/9257/0268/files/jetejuku.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_off00006d1e.bin
afc0211545207e1b216b67cb850e19e5bfe458401bdc94818754e00afae5e6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1E 5096 bytes
font_01_sfnt_off00007e53.bin
09ba3c112b4ab3def9320f286db3ec9e2d18f2728355e10a52d1338641915761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E53 10616 bytes

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