Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffa62a4ded2c6c2…

MALICIOUS

PDF

45.3 KB Created: 2020-09-01 06:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e932e4b0d4180fd641af2a11a87a4271 SHA-1: 9fff673434d8dc962c34e4e51f61d5498a9f2bb1 SHA-256: 8ffa62a4ded2c6c275c536e8004e84a3d79e7490575fd6892d14007948d56d49
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=angielski+test+z+czas%25C3%25B3w+pdf'. This URL is presented within the document body, disguised as a link to an English grammar test PDF. The document also contains a large number of links to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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=angielski+test+z+czas%25C3%25B3w+pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9654/files/48047282193.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8389/files/nasorazabafudiwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/lasosofarolozugajovigu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/tererixipukupotajin.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/51399675431.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0433/7673/8462/files/wonisewinebewemi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/quantum_chemistry_and_spectroscopy_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/75578242657.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/76079425138.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/commendable_work_performance.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/janson_history_of_art_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/housekeeping_checklist_format_for_factory.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060aa.bin
a0256a0f096f5a30480bed3574b89f78d75953524cb504fe3bb467e89f6740e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x60AA 5236 bytes
font_01_sfnt_off000072a6.bin
12bbe0298b0ce733463dce2f9ea751d967876874b10f0f25ee04bb7948a8b864
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A6 12196 bytes
font_02_sfnt_off000098a5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x98A5 4324 bytes