Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9b1a8b4443d011…

MALICIOUS

PDF

41.6 KB Created: 2020-08-05 23:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 197c761e9b7d13211c329077daf5129b SHA-1: baa870ca2936b2c732c6fc470a93227d4d37a4e3 SHA-256: 0c9b1a8b4443d0118662dc32d4aec72f243fafec955cb8e32006611c33f9224d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, including one pointing to known malicious redirector infrastructure at ttraff.com. The document body, though obfuscated, contains text related to job descriptions and includes the malicious URL, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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=accounting+supervisor+job+description+pdf
    • http://files.threecreekaussies.com/uploads/1/3/1/4/131438150/xanokaf-nojugi-zutisasajev-vuwubananugozim.pdf
    • http://files.superbiene.com/uploads/1/3/1/1/131164452/17b995c0.pdf
    • http://files.tramitesexpressinsurancega.com/uploads/1/3/0/7/130775432/lizabez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/8317862215.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/1268200325.pdf
    • https://cdn.shopify.com/s/files/1/0431/1144/8729/files/bidup.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/17448683325.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/how_to_block_someone_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/nutrition_care_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/91507051803.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/39253583984.pdf
    • https://cdn.shopify.com/s/files/1/0438/4954/7936/files/mugevugevubok.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/96719208788.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/kezibikufobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2105/files/pokepilo.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_off00006534.bin
7482c5345eaae9a14b4722d806af09f8a86068e0864b5f954cac6bffb1df1d2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6534 5348 bytes
font_01_sfnt_off00007788.bin
439a98597ad0980e70a5de3189cdf0f0c4b1f6ed10e4ee5bdac7c3ce238eb3b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7788 9892 bytes