Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66931d90b17db8a…

MALICIOUS

PDF

43.2 KB Created: 2020-08-10 23:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2510c6676395dc1b4a7f65a25d53887c SHA-1: 693c914a7125917b5ce475d2863854801ebd4abf SHA-256: e66931d90b17db8a039615c6c511d80c6d13b581a8d4e3384e9f54218601b041
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=yoga+back+stretches+pdf', suggesting a lure to disguise the malicious redirection. The PDF also contains a large number of external links, many pointing to Shopify, which is flagged as a PDF_SEO_LINK_FARM.

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=yoga+back+stretches+pdf
    • http://fetuwazed.parkheiser.com/uploads/1/3/1/4/131438477/2502361.pdf
    • http://files.compassionvet.com/uploads/1/3/2/3/132303083/8659702.pdf
    • http://files.belfastarearentals.com/uploads/1/3/1/8/131871745/2965251.pdf
    • http://filasot.ivoryisacolor.com/uploads/1/3/1/6/131606289/61db6f02e1a0.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/28782719280.pdf
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/13743733848.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/sabalutidopiwotow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/awakening_the_heroes_within_carol_pearson.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/83306995590.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/tomolifumusipoded.pdf
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/51209699047.pdf
    • https://cdn.shopify.com/s/files/1/0436/2030/3006/files/wobuviruxuremopege.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65022979336.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3486/files/90763617804.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6641/files/75400817419.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_off00006ac8.bin
034e35950fc4689ef9035ca699ae2db091c8e64d316ac5b234779004a23ab354
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC8 5548 bytes
font_01_sfnt_off00007d95.bin
69dc6ef48bad2db3340b414620372ccd0ccdd38d6e134d70287fb64e6faf88b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D95 10052 bytes