Malicious PDF — malware analysis report

Static analysis result for SHA-256 529508b6b6cc3c50…

MALICIOUS

PDF

42.9 KB Created: 2020-08-11 16:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9452f794dd3f2cd4d71e907759d9e48 SHA-1: 6992955fbc5aa3d3150112a8fd80622bcb9e5ef4 SHA-256: 529508b6b6cc3c50363fd7fc4ea3f9306716e30d2e05bd3e2320b07b52ebbe08
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=boat+bill+of+sale+canada+pdf', suggesting a lure to a malicious site. The presence of numerous links points to a link farm or redirection strategy to distribute malicious content.

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=boat+bill+of+sale+canada+pdf
    • http://vikowat.jo-ocean.com/uploads/1/3/1/3/131398020/eab8cf.pdf
    • http://vixegazub.codyshauling.com/uploads/1/3/1/3/131383483/4585bbbfbe36624.pdf
    • http://wamuzokot.dynamissconsultancy.com/uploads/1/3/1/4/131453870/2453944.pdf
    • http://sudalu.artisanwineandcheesecellars.com/uploads/1/3/1/3/131384635/miwepenib.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5317/files/92974561736.pdf
    • https://cdn.shopify.com/s/files/1/0437/7185/5002/files/verizon_fios_dns_server.pdf
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/jivales.pdf
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/risk_management_and_insurance_mba_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/dumixof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/domamusuvusuzexi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32867625585.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/binupepanonuwakuraz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/75768556930.pdf
    • https://cdn.shopify.com/s/files/1/0436/6955/3305/files/muhammad_al_ghazali_books.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_off00005cc5.bin
f3858050c59266ccc9ba86bc96b1966792bf116236686d8412f6ca2040a54849
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC5 5032 bytes
font_01_sfnt_off00006de2.bin
7b4f1547bf6bf49612ae561eefe14dc2482e77a83606fe7a456eeaf87edde9f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE2 10200 bytes
font_02_sfnt_off0000908b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x908B 4324 bytes