Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5986d2eee86645…

MALICIOUS

PDF

45.8 KB Created: 2020-08-02 14:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e153c606762fb60bb47b4911c24f663 SHA-1: c5afd4d728308d1d69df2fa87a69dcbf6a699fe2 SHA-256: 5d5986d2eee8664594f01840943164bc78bf1464f0db00f71648e9736cf6058d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=sekiro+feeding+grounds', suggesting a lure to a malicious site. The presence of numerous PDF links indicates a link farm strategy, likely for SEO manipulation or distributing further malicious content.

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=sekiro+feeding+grounds
    • http://files.allgirlithm.org/uploads/1/3/2/7/132712120/dinesovolaje.pdf
    • http://files.iangarlandfalconry.com/uploads/1/3/1/4/131453124/4832544.pdf
    • http://files.minatangoboutique.com/uploads/1/3/0/7/130776077/8256562.pdf
    • http://files.hiltonbell.com/uploads/1/3/1/3/131380177/luxaxef.pdf
    • http://files.farcornersmusicals.org/uploads/1/3/1/4/131453084/kirazim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5590/6970/files/break_brick_wall_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/xagupurozanobubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/vubupi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7495/9000/files/67510763456.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/30239590053.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/tonenonigif.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/zofujapagapopaxapanasemo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9450/6661/files/24891020745.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_off0000776e.bin
e434babdf2f5908364d3461986814e588a904cb50ff5796ce6b0bf469591086a
pdf-font-stream PDF embedded font (sfnt) at offset 0x776E 5000 bytes
font_01_sfnt_off0000888b.bin
09ebebb359ebddddaa8049b6eb3c5487eed4e672d298f7b0b831b605fc0cba01
pdf-font-stream PDF embedded font (sfnt) at offset 0x888B 9968 bytes