Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c900042b70c6d5…

MALICIOUS

PDF

41.0 KB Created: 2020-08-21 07:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 585c78a96c564128de60840f87d9cde3 SHA-1: 3275e2e09998a7c11c16ff3bfec6edd12b29408c SHA-256: 18c900042b70c6d551c68d7c24d0e169137e7e025c17aa4592dec37898fa36e9
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=delivery+note+excel+template'. The document body, though heavily obfuscated, also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of 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.com/pify?keyword=delivery+note+excel+template
    • http://files.saveurlifeoutreach.com/uploads/1/3/1/0/131070911/e805218130ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9163/9968/files/satin_camisole_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/91436341045.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3421/files/page_break_inside_avoid_mpdf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6655/files/59380566306.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/zaburzenia_psychiczne.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7238/files/56947877940.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0321/files/descriptive_research_examples_of_study.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/scientific_notation_practice_problems_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0438/9198/2491/files/ritoriximomosijiwozo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/rofafurosobatekatixikor.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/17252016054.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6867/files/viryual_girl_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/1577/4108/files/24855412177.pdf
    • https://cdn.shopify.com/s/files/1/0437/0992/3480/files/wozozepufakira.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_off0000645e.bin
867687a692cc6706f06e0820e4530ea28fb23de64d620bf144fc7e0e0e5b410e
pdf-font-stream PDF embedded font (sfnt) at offset 0x645E 5128 bytes
font_01_sfnt_off000075cb.bin
a3bdc0aefc9d7ec4423e23409a8f3632ade06e3f20ff3a0934a40b808aa17c20
pdf-font-stream PDF embedded font (sfnt) at offset 0x75CB 9864 bytes