Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2b14845a79e657…

MALICIOUS

PDF

49.5 KB Created: 2020-08-21 23:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26fea369006b9c40afefa72742d76f91 SHA-1: 5fd64197a0ba4c3cdb5a16fff8b212b87d9c2ed9 SHA-256: db2b14845a79e6575a8d8edc1ded789654023e00799f6d176b619a622f981611
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with the primary malicious URL being a redirector to a phishing or scam page. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a lure to external content. No scripts were extracted from this sample.

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=acog+pelvic+exam+guidelines
    • http://files.godard-christian.org/uploads/1/3/2/7/132740606/bebd37b6baf831.pdf
    • http://files.liftislandfashion.com/uploads/1/3/1/6/131606807/604476e2.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4440/files/boxemov.pdf
    • https://cdn.shopify.com/s/files/1/0438/5354/5632/files/editable_business_model_canvas_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/wowilemopulero.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2527/files/gewokijikabetu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/61099173858.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/69069130088.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/edit_my_file_for_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/4301/0213/files/github_vs_bitbucket.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_off00008402.bin
d5b315a5cb1ee931c1ac3c574795c43bb05003bcea012017525627353f12452a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8402 5416 bytes
font_01_sfnt_off00009663.bin
c903e4dacd7b6a5a24a92b4a7f30577fb09ce3409a6f7637ca7c2800606b1604		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9663 10340 bytes

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