Malicious PDF — malware analysis report

Static analysis result for SHA-256 880ff943d4ad1ba1…

MALICIOUS

PDF

67.3 KB Created: 2020-08-15 03:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 850438723b44f262994c8ac5491e0a6d SHA-1: ed4d2f690fae7428f92753f2ad01caed2f2cf8a7 SHA-256: 880ff943d4ad1ba18f821e3d50719b3dc665cd8211de60058d68c5f09e431788
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically identified as a malicious redirector. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. While no scripts were directly extracted, the PDF structure and embedded links indicate a potential for malicious redirection or content delivery.

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.ru/pify?keyword=compress%2528+bitmap.+compressformat.+jpeg+100+baos%2529
    • http://files.yogitreewellbeing.com/uploads/1/3/2/8/132816042/voxiwebujanogomowafu.pdf
    • http://gakix.rachellacey.com/uploads/1/3/1/4/131407535/zalul.pdf
    • http://redazefi.imatrictech.com/uploads/1/3/1/4/131438177/bumujiwigukufupi.pdf
    • http://files.southernschoolphotography.com/uploads/1/3/1/3/131379213/kixorogamoturuzaduxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/7339/5106/files/honda_radio_code.pdf
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/nakogev.pdf
    • https://cdn.shopify.com/s/files/1/0447/6272/6551/files/movikijezupetegubiresazul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wozofedotomutigetipire.pdf
    • https://cdn.shopify.com/s/files/1/0439/4293/6731/files/14054430056.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/zatuludonixuderoboges.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/49314085357.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/rapurekapirifodet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8fc.bin
f9cad54fa55cbb8328494936ea4824e71e9510ce730df37c2c040e627febf7ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8FC 5604 bytes
font_01_sfnt_off0000bc2c.bin
0b06f725d63ac51b04cd0d4dc0231ee52236f5fb64186109fdc1cec9189858d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2C 16660 bytes
font_02_sfnt_off0000efb4.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 4324 bytes