Malicious PDF — malware analysis report

Static analysis result for SHA-256 420258739dbae4c8…

MALICIOUS

PDF

43.0 KB Created: 2020-08-03 23:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc78b5ba78f3b3f8e5828c2733fd945 SHA-1: 46f7e3410777b7c5716505f6ab4a454e96a362d4 SHA-256: 420258739dbae4c82d3e00673090d668ebcb8334e1157ec71126591b0001355c
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results, specifically for 'Biology book for senior high school pdf'. One of the primary links directs to a known malicious redirector, ttraff.cc, which likely serves as a gateway to further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or content-luring scheme.

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=biology+book+for+senior+high+school+pdf
    • http://files.escambialatin.com/uploads/1/3/2/6/132695392/senilix-botuxixigup.pdf
    • http://files.rachelfoxfrazier.com/uploads/1/3/1/0/131071167/divozudageri.pdf
    • http://nakuwi.mywoocatmanagement.com/uploads/1/3/0/8/130874478/2512804.pdf
    • https://cdn.shopify.com/s/files/1/0440/8547/7541/files/mekolugotefawevidifimono.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/gitanuxumobojax.pdf
    • https://cdn.shopify.com/s/files/1/0435/8576/5533/files/xisewido.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/7685106563.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/10931023591.pdf
    • https://cdn.shopify.com/s/files/1/0436/1096/4131/files/37591955662.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/54126046858.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/1134698611.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6806/files/13861189394.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/ahler_and_ogletree.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6147/files/xigejuxosagugoxig.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/59729504576.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8498/files/97753923634.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_off00006977.bin
20598a79b6f7a6940d6aaf427603a08448c0d826f175dc4eb341de36470af8f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6977 5564 bytes
font_01_sfnt_off00007c77.bin
635dad8f4482d225ca4386f39ee2a5f2ae4351a910b612557e1cd8ad502ec485
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C77 9864 bytes