Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed874fb33af2ce40…

MALICIOUS

PDF

34.0 KB Created: 2020-09-18 04:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb74a014f2d5afa2120ff4932a88e116 SHA-1: 802cfcdd350ee73fa97885698a557f3e9686d1ee SHA-256: ed874fb33af2ce408fe46395c25c03d4d2b061f9e2045ad5e1b52e5c3ee9882d
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector link. The document body, though partially corrupted, contains text related to 'biology answers' and includes the same malicious URLs. This suggests the document is designed to drive traffic to malicious sites, likely for SEO spam or phishing, rather than delivering a direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/wix?keyword=12.1+section+assessment+biology+answers
    • http://dusem.owenty.com/uploads/1/3/2/7/132712461/7041457.pdf
    • http://files.christianmendozamusic.com/uploads/1/3/2/7/132741322/3492435.pdf
    • http://kojoziluv.opticalonlinestore.com/uploads/1/3/0/9/130969916/newasamojewa.pdf
    • http://safupavuk.mary-jomurphy.org/uploads/1/3/0/7/130775411/tofug.pdf
    • http://nazup.magicaladventurestravelwithjennifer.com/uploads/1/3/2/6/132681342/d2ee8ea36e.pdf
    • https://c7b01389-c04e-407c-9a5a-02d3ff161200.filesusr.com/ugd/daca0d_31acef0e5aab4170a9d41fa918dc398c.pdf?index=true
    • https://4ad65bef-42b5-4634-b027-8653d179962c.filesusr.com/ugd/d3758e_d8fb434ac2cf405f817400196185bb84.pdf?index=true
    • https://eaa80888-1ef4-4f7f-b358-f03099b23cba.filesusr.com/ugd/41f880_6beecb5781f24243894ee39fa2ee91cf.pdf?index=true
    • https://a5081ad3-1be8-431a-a2a4-44756163c258.filesusr.com/ugd/9edd50_b25fb4d53a6b42c5b23599ffecd17485.pdf?index=true
    • https://15d58ce7-da52-4ceb-9305-41a860fc0774.filesusr.com/ugd/e80f4c_2178a56db9504ed8b0983396bf889e92.pdf?index=true
    • https://dbd3c9c0-900a-4830-9e8a-e2f526370b1e.filesusr.com/ugd/6f5f23_6afaaf19dbd34e149235ecb7f7b9a5ab.pdf?index=true
    • https://b7b0f909-57dd-437c-a47e-9af685de9243.filesusr.com/ugd/d162e3_e49806621f424cd6b8fa8c55f6f2578e.pdf?index=true
    • https://0a0d5f93-49c5-4d67-8176-64133a3debb9.filesusr.com/ugd/e5a943_126c98cf202e46b3b58e00bbaad47d15.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/5654/6463/files/sopewemutojajezigizumubuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/93460177731.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_off000046dd.bin
c273b1db9b563789252fb8c2a5e974415b39b17960d33b4364de2a2f7359be31
pdf-font-stream PDF embedded font (sfnt) at offset 0x46DD 5576 bytes
font_01_sfnt_off000059e1.bin
40cbe1de427c81bd6cd4db78162ea3e630e224d619498dd4d371b4b7596ded60
pdf-font-stream PDF embedded font (sfnt) at offset 0x59E1 9740 bytes