Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba3a5e2317e3e7d…

MALICIOUS

PDF

44.2 KB Created: 2020-08-23 23:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36a0981281410baff8adf6fdbe607761 SHA-1: 0ca619724577588e51b00671909b1fad6e0def30 SHA-256: aba3a5e2317e3e7d7277f855bd2bcf3f5bff129d7f6d66b0b396a8dcbf5e48f1
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 obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains text related to a crossword clue and the malicious URL, suggesting a social engineering lure. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm designed to distribute the 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.com/pify?keyword=crossword+answer+for+use+delaying+tactics
    • http://files.nk-opatija.com/uploads/1/3/1/3/131381078/d57c26a215948a.pdf
    • http://files.motionforlifept.com/uploads/1/3/0/7/130739062/32c82075ea4.pdf
    • http://files.theartplacestudio.com/uploads/1/3/0/7/130775590/6383720.pdf
    • http://files.highlanderteach.com/uploads/1/3/1/3/131384300/80917a322283.pdf
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/alan_turing_biography.pdf
    • https://cdn.shopify.com/s/files/1/0437/8125/9421/files/67458543514.pdf
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/june_barcarolle_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/85903227408.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4757/files/70245823733.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/gafekudexiwikebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/63655515254.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/kaxuwutusage.pdf
    • https://cdn.shopify.com/s/files/1/0431/0849/9618/files/pelebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0199/3622/files/belip.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2817/files/60970960541.pdf
    • https://cdn.shopify.com/s/files/1/0433/8948/5221/files/oxidative_stress_alzheimer_disease_pdf.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_off00006f0f.bin
96417ab287c884df812b96edcaa4198a701330e12a858c39710b75d91b3f4951
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0F 5288 bytes
font_01_sfnt_off00008136.bin
c58261430805395c5fdf6d4afe571640eb21ff1c5053b8c3677093a9ec80e223
pdf-font-stream PDF embedded font (sfnt) at offset 0x8136 10144 bytes