Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6827c5dbff3d3f…

MALICIOUS

PDF

40.8 KB Created: 2020-08-11 17:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1379a69ea58be35ff9dbe8b290e44413 SHA-1: 1edb74916cf0f5e6210a4a1d57ebe25f36ad8343 SHA-256: cc6827c5dbff3d3f94334d9c180fa5ed53859bb0c4e43741133ae6a0d3578314
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

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 text related to 'accounting ledger posting pdf' and the malicious URL, suggesting a lure to trick users into clicking the links. The primary malicious link identified is https://ttraff.ru/pify?keyword=accounting+ledger+posting+pdf, which likely leads to further malicious content.

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=accounting+ledger+posting+pdf
    • http://wamiwaz.heavenlychurch.com/uploads/1/3/1/6/131636664/6291699.pdf
    • http://files.treasurelakesfish.com/uploads/1/3/1/6/131637853/mewole.pdf
    • http://files.trevormlewis.com/uploads/1/3/1/3/131381919/kebesejefixuw-linutozamame-masaxu-sosutabir.pdf
    • http://tibimolat.imsweightlosscenter.com/uploads/1/3/1/4/131407668/letajus.pdf
    • http://files.appleleafstudio.com/uploads/1/3/2/7/132710743/4217440.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/32186379067.pdf
    • https://cdn.shopify.com/s/files/1/0436/3337/7440/files/xavilenovisunixutef.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/gopotezivebolan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9999/6839/files/2092975207.pdf
    • https://cdn.shopify.com/s/files/1/0437/7300/1877/files/74139266941.pdf
    • https://cdn.shopify.com/s/files/1/0435/4909/8148/files/bond_energy_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/66572791290.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/harvard_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/36007986683.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0180/files/12398058037.pdf
    • https://cdn.shopify.com/s/files/1/0428/4550/3655/files/gw2_warrior_builds.pdf
    • https://cdn.shopify.com/s/files/1/0433/0972/7912/files/bawixukepegafunepagova.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_off00006210.bin
e6f04401896755f2dc61fa887df3aa07f989c467bcb1ea675f5af6ac1a9ac9b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6210 5104 bytes
font_01_sfnt_off00007376.bin
e9bbcd3d573fffc0dffc8770e166d5db8366488e8553e40967d9c874f4f018e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7376 10248 bytes

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