Malicious PDF — malware analysis report

Static analysis result for SHA-256 c950db543387b35b…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 09:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e607a508ed07608760ab972670a4f331 SHA-1: e6b4f16239baeabcb8e813648e2ae2913f42cd8d SHA-256: c950db543387b35b0978379b92efc3f85354d6cedc40995de999abf374d49fd6
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a critical heuristic identifying a link to a known malicious redirector. Additionally, it contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The primary malicious URL, 'https://ttraff.cc/wix?keyword=labyrinth+of+refrain+alchemy+guide', is presented as a guide, likely a lure to a phishing or malware site. No scripts were extracted, and the document body was heavily obfuscated.

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.cc/wix?keyword=labyrinth+of+refrain+alchemy+guide
    • https://cdn.shopif
    • https://static.usrfiles.com/ugd/856cea_43e541681b02434da0374c84a9686863.pdf
    • https://static.usrfiles.com/ugd/c3f88d_4fb53bb758bd4b08a3f0d963504d11b1.pdf
    • https://static.usrfiles.com/ugd/e4bc37_ea8c7627828844179af0bd678274f146.pdf
    • https://static.usrfiles.com/ugd/f459ea_bd60cd1626a94a24b4a732d7e908f20c.pdf
    • https://static.usrfiles.com/ugd/4b7290_9c3b1f52d1514c629bb841ba401d51d4.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/application_letter_for_teaching_position_fresh_graduate.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4933/files/retinopatia_hipertensiva_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0439/0964/4456/files/calvinism_and_arminianism.pdf
    • https://cdn.shopify.com/s/files/1/0436/0024/8995/files/76054560728.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5809/files/fubesuwodobaxuwuramelix.pdf
    • https://cdn.shopify.com/s/files/1/0436/6503/1321/files/25224574300.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0576/files/avast_removal_tool.pdf
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/tovuzovilipenifebifisu.pdf
    • https://cdn.shopify.com/s/files/1/0447/5289/6154/files/56812291113.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8992/files/39389076547.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_off00007229.bin
9d3622ca339ddaedf98233cd29f5c621a84d4bfcb1b38ea1e3b547ca463d068d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7229 5440 bytes
font_01_sfnt_off00008486.bin
91b7f5c807ff5fb696830f977bcdcadd797e1887687b5d49dea4a5bb7f8661c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8486 10412 bytes

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