Malicious PDF — malware analysis report

Static analysis result for SHA-256 099f41675851f6d4…

MALICIOUS

PDF

47.3 KB Created: 2020-08-06 06:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c628a22b145f54e9fa0224a4de81ef5 SHA-1: a00e8e677a9cd871ffeacd19d89a318d695c9190 SHA-256: 099f41675851f6d45d6d4c09758e0da04b0d9c920d66a41e5ff83672cb206487
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning to drive traffic to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=design+of+built+up+column+pdf`. The document body, though heavily obfuscated, contains references to `open_powershell_here.pdf`, indicating a potential attempt to execute commands or download further payloads. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=design+of+built+up+column+pdf
    • http://files.surrenderedtochrist.org/uploads/1/3/2/6/132681656/wulegi.pdf
    • http://files.kennedysarff.com/uploads/1/3/0/7/130775747/xapometedixoxav.pdf
    • http://files.coastalcandyphotography.com/uploads/1/3/2/6/132681602/2830847.pdf
    • http://files.jingleexpert.com/uploads/1/3/0/7/130776493/879dda94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/27789702294.pdf
    • https://cdn.shopify.com/s/files/1/0438/2588/9442/files/pimot.pdf
    • https://cdn.shopify.com/s/files/1/0434/0704/8860/files/judagavulivuxirosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/92865033445.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/zegofitigatopunijamofobem.pdf
    • https://cdn.shopify.com/s/files/1/0445/5071/7604/files/open_powershell_here.pdf
    • https://cdn.shopify.com/s/files/1/0436/9291/6886/files/lunibuwutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/accounting_principles_12th_edition_solution_manual_chapter_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51191810805.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/vuxopogovugafirezaruf.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/sokini.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/
    • https://cdn.shopify.com/s/files/1/0436/9
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072cf.bin
08771ae30a4f93187285eff59a96f9791c8a3d3faa14b1489c23545c40bed50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CF 5308 bytes
font_01_sfnt_off000084d5.bin
299aa602466294272d7456ec3965e9ef95f8bdecd3ddf7c050b24b9b29171783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D5 14260 bytes

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