Malicious PDF — malware analysis report

Static analysis result for SHA-256 7952632938cf79f7…

MALICIOUS

PDF

43.9 KB Created: 2020-08-21 12:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1f43c8703bd3435044e67f649363748 SHA-1: bc3c10d080cd5e469c03e20a0d301427b562d936 SHA-256: 7952632938cf79f772b43a09e88c32f2f7fb95b8abb5f3149f1f12448cb68b7e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, suggesting a lure to a malicious site. The presence of a link farm indicates an attempt to distribute malicious content broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=environmental+hygiene+definition+pdf
    • http://pegubi.soundstonelaw.com/uploads/1/3/1/0/131069934/desatu-ganolejep.pdf
    • http://files.olsyouth.com/uploads/1/3/1/4/131406841/2175288.pdf
    • http://nezotop.waverleyplastics.com/uploads/1/3/0/7/130775951/1403524.pdf
    • http://files.lovedovecottage.com/uploads/1/3/2/6/132695679/6603451.pdf
    • http://files.lakeregionbiblechurch.org/uploads/1/3/0/8/130814644/8732544.pdf
    • https://cdn.shopify.com/s/files/1/0438/4283/0496/files/pathology_mcq_questions.pdf
    • https://cdn.shopify.com/s/files/1/0437/6880/7586/files/steam_calorimetry.pdf
    • https://cdn.shopify.com/s/files/1/0434/2326/9014/files/68649041659.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/jatabuzewawemuluzoraku.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/79867383084.pdf
    • https://cdn.shopify.com/s/files/1/0433/3876/0342/files/bigivufijit.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/55593445715.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/51233586455.pdf
    • https://cdn.shopify.com/s/files/1/0433/5465/2821/files/three_kingdom_2010.pdf
    • https://cdn.shopify.com/s/files/1/0440/0958/6853/files/sazejogalajusajijemufaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4179/files/android_floating_button_add_icon.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e9f.bin
2ae2b16e4bf3ac9b588b0f3761cbb52945680ab3d43099922f1a04e33dee8acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9F 5396 bytes
font_01_sfnt_off000080d6.bin
716ecdfb0049ab93e657ac29894f8db6755872af516328ee66b083a9b8c1e460		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D6 9936 bytes

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