Malicious PDF — malware analysis report

Static analysis result for SHA-256 6908c7d93fb87b44…

MALICIOUS

PDF

38.5 KB Created: 2020-08-11 12:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 644a5b84caad5334f85b2e571d59a47d SHA-1: 499976049308f1c364deffc945cf49e3f9be5e80 SHA-256: 6908c7d93fb87b44e240ea756f2f2ddfa2c47190e0cb45ccf3bb050624a85632
154 Risk Score

Malware Insights

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

The PDF contains a deceptive link that redirects to a URL known for malicious activity, masquerading as a textbook download. This link farm technique, combined with the ML classifier's high confidence, indicates a malicious intent to redirect users to potentially harmful content. The document body itself contains obfuscated text and multiple URLs pointing to external PDF files, further supporting the link farm heuristic.

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.cc/pify?keyword=isc+class+11+biology+textbook+pdf+download
    • http://lufut.stephenreavesart.com/uploads/1/3/1/3/131383297/65886158aef59d.pdf
    • http://files.rocmazeng.nl/uploads/1/3/2/6/132681954/4547190.pdf
    • http://files.saxenalab.com/uploads/1/3/1/4/131406785/1940361.pdf
    • http://files.commitment-health.com/uploads/1/3/0/9/130969751/wigitovote.pdf
    • http://files.loveyoubff.com/uploads/1/3/0/7/130739522/1014446.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/30062416141.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/12051708468.pdf
    • https://cdn.shopify.com/s/files/1/0440/5719/8757/files/mixiroze.pdf
    • https://cdn.shopify.com/s/files/1/0435/1862/3896/files/27681892289.pdf
    • https://cdn.shopify.com/s/files/1/0435/2347/3560/files/71209491554.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/vudezuzebe.pdf
    • https://cdn.shopify.com/s/files/1/0437/4285/5319/files/caroline_myss_archetypes.pdf
    • https://cdn.shopify.com/s/files/1/0432/5077/8275/files/43639474904.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15518423203.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4027/files/parliamentary_debate_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1000/files/josaxusevowagonifefo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0735/files/xivaxanegewukudipuxit.pdf
    • https://cdn.shopify.com/s/files/1/0432/6054/3138/files/the_princess_and_the_frog_story.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/xodasijes.pdf
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/gamojagigeliwerubomita.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_off000056c9.bin
51e2fca570aa64af3d6ce42ddbb48215da0c5dc5b700dd67cb8bc1b2b17a53f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C9 5684 bytes
font_01_sfnt_off00006a50.bin
0a666dc9814d758a1d746ac02d81c64b22b1b8bcb0afda06207e216b7c131f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A50 9968 bytes

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