Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4228951dad4bfb…

MALICIOUS

PDF

42.3 KB Created: 2020-08-04 01:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68a220754313027bc5aef1cc421d3752 SHA-1: c9388dfb40625c41d58c55cd2aa52b448ab4b8e8 SHA-256: 6e4228951dad4bfb026ab7cf36ffdcb7169c98b074c281609960de2c3ff661f2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to malicious content. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic, indicating the primary lure.

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=importance+of+traditional+ceremonies+in+zambia+pdf
    • http://files.prevedelli.com/uploads/1/3/0/7/130775588/2570749.pdf
    • http://kukajeso.heavenlyinfused.com/uploads/1/3/1/4/131437515/c5c62f.pdf
    • http://files.chapman-bond-chatman.org/uploads/1/3/1/4/131409309/nowovijavejub.pdf
    • http://files.loveliesandthings.com/uploads/1/3/1/4/131437311/ca08cf.pdf
    • http://files.food4good.org/uploads/1/3/0/8/130874533/dekoduve_lerajugoxe_xowakegapog_kakuresesoxeliz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5874/8837/files/tinumodogidopuriwexave.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/jibutevafinovinex.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/vidozozafaba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/zevusudo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigorekotat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74140302582.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/72316833669.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4008/files/timonapuferiminifepa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/dixaxesaw.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_off0000677c.bin
fac6bcabd4ff9c9b9e9a58f12b154f688e6ee3aff78a8f6464438e510d8b3a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x677C 5428 bytes
font_01_sfnt_off000079d7.bin
16e25bcb9aa65dc64d00c6823aa9b2cd208ad8e3e05f44cc485baaa5fb8bff61
pdf-font-stream PDF embedded font (sfnt) at offset 0x79D7 9880 bytes