Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcdbf97894f1211…

MALICIOUS

PDF

47.6 KB Created: 2020-08-16 22:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c53207164e52a941681e6e0fa68d55b1 SHA-1: f74b9893543dff218cda1d31d879637349a31321 SHA-256: 7fcdbf97894f1211eb75fe4eaa0a62af0806fac87227456ce3421c4ce1c3e33e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to funnel victims to a malicious site. The document also hosts a large number of external PDF links, many pointing to shopify.com, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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.com/pify?keyword=complete+heart+block+nice+guidelines
    • http://files.my-artsite.com/uploads/1/3/2/6/132695701/muwogufu-buporugosunoka.pdf
    • http://movuso.workloadautomation-community.com/uploads/1/3/2/8/132814838/rimeke.pdf
    • http://gobolu.francesmcmahonward.net/uploads/1/3/2/6/132695329/5169560.pdf
    • http://zuwov.gunmanualsonline.com/uploads/1/3/1/1/131163962/nekibusifijag.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/nuget_package_from_artifactory.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/zozujosobobebeke.pdf
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/calea_standards_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/vande_mataram_lyrics_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/pujaditiburi.pdf
    • https://cdn.shopify.com/s/files/1/0454/7330/0632/files/alkaline_plant_based_diet_aqiyl_aniys.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/84405392292.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/financial_risk_management_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7587/8564/files/basic_chemistry_review.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_off00007d93.bin
dad8d557f629bc979f625941f80920ba8416c708e99e4a393de5998f08752151
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D93 5596 bytes
font_01_sfnt_off00009061.bin
a8674b938cff1ca562c5e70fd2b9ff12470d0611af2674391a40d1582d1ca11d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9061 9816 bytes