Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4ad88b482797cd…

MALICIOUS

PDF

47.9 KB Created: 2020-08-18 21:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec1be66a5f56325a323e2edddae7343 SHA-1: 19493da35ec4b2f827bf14ce82299c7572189bec SHA-256: 6d4ad88b482797cd70c8935d408eb19b8d931bfebf53fca52eaab7ba5a3be7f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact payload or further intent beyond redirection.

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=pc+full+form+in+engineering
    • http://files.jackandjamesapiaries.com/uploads/1/3/1/4/131437423/kosikuxerebedebuw.pdf
    • http://bonuzozat.diamondcb.com/uploads/1/3/1/4/131483281/5b6b00d15ed.pdf
    • http://files.bradleystokejudo.com/uploads/1/3/0/7/130775180/6614301.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/angola_janga_download_completo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/wumulij.pdf
    • https://cdn.shopify.com/s/files/1/0434/6894/7616/files/nexidari.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/suxawuwirunagizemo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/tezatozimegesubibibiwuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/archicad_15_library_objects_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/7572/1633/files/gikuzom.pdf
    • https://cdn.shopify.com/s/files/1/0429/8031/1203/files/sufilinorirug.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/aqua_unit_patrol_squad.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/81887873169.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/wuxizevupavizaxarunag.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/82852514516.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_off000076a5.bin
b17f8e85e6fb2e7aad3dd4c687e7422f8a5497f4d9884d3449578e503be77ecc
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A5 4816 bytes
font_01_sfnt_off000086e9.bin
4de55e0d4e08a5031159c64a8a777d50fe745e9e022a7eb1c748ec08efe88730
pdf-font-stream PDF embedded font (sfnt) at offset 0x86E9 14196 bytes