Malicious PDF — malware analysis report

Static analysis result for SHA-256 695e9ceb3b0460ed…

MALICIOUS

PDF

39.6 KB Created: 2020-08-02 21:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca12f0468900d26bae7339127207c2cd SHA-1: 0f15f2858216866eca283d770e5506c8164eaa2d SHA-256: 695e9ceb3b0460ed2bdc525a8b39d8867d640e4506968e147f81942f1876c866
154 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous external PDF files, with one link pointing to a known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to redirect the user to malicious content. The document body itself contains obfuscated text and URLs, further supporting a 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.ru/pify?keyword=deeprock+salt+wow
    • http://files.kathrynmarkey.com/uploads/1/3/1/6/131606890/a7a036a9a.pdf
    • http://files.gregpatmore.actor/uploads/1/3/0/7/130740496/muxudulimuwevug.pdf
    • http://files.jomichellepro.com/uploads/1/3/2/7/132740553/wefekanulibof_pimumapek.pdf
    • http://files.seacoastdockdogs.com/uploads/1/3/1/4/131453436/49b2febdcc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9354/1532/files/65020069451.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/zikajaxewumukugozusos.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/52846818939.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9768/files/88375673125.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2527/files/20413476760.pdf
    • https://cdn.shopify.com/s/files/1/0437/0412/3557/files/nozopesubum.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/63571535624.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7740/files/devious_minds_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/76765132680.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_off00005d1d.bin
3e3782ac33426116793233c135be90cf39b090a18e9c7bf2a34c4195513557ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1D 5084 bytes
font_01_sfnt_off00006e92.bin
a243dfbb279f4194418c0f6564f5fad886b4a9c4cb444b0e30a83f23a0853c00
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E92 10468 bytes