Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d10c14bb41b3da0…

MALICIOUS

PDF

68.3 KB Created: 2020-08-27 12:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 178fa29bfa7fdde7a69337bdac5871d3 SHA-1: dc25c9326c59bc940405931c85adb39a686489d5 SHA-256: 4d10c14bb41b3da0074221dff2e92a8d3c5161cc5b9e7c37da2067e0a86edf85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting the document's purpose is to trick the user into visiting this URL. The ML classifier strongly supports the malicious nature of this PDF.

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=antenne+long+fil+comment+en+fabrique
    • http://witod.dtoxtogo.com/uploads/1/3/1/4/131409090/3371014.pdf
    • http://piviwuve.vision-destinations.com/uploads/1/3/1/3/131398104/mogarisitod.pdf
    • https://cdn.shopify.com/s/files/1/0428/5795/5487/files/achievement_test_sample.pdf
    • https://cdn.shopify.com/s/files/1/0449/9701/7768/files/76981724902.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/gavoxefisimapo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6394/8950/files/monikabemofedoziras.pdf
    • https://cdn.shopify.com/s/files/1/0433/4914/7803/files/1464966709.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/powafudo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0438/4037/2896/files/comment_faire_pour_avoir_confiance_en_soi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/xexuzitu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b092.bin
1b5b105bd1cd9d4879b8430e169d68a4a36725786337422c12d8ba7e63e172e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 5276 bytes
font_01_sfnt_off0000c277.bin
0ea34f4bd4126637fb47c372833a3286975edaa7659e125ba32896b4d8a1f3a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC277 13552 bytes
font_02_sfnt_off0000ed1a.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 16204 bytes