Malicious PDF — malware analysis report

Static analysis result for SHA-256 80829fb17e3872cf…

MALICIOUS

PDF

39.0 KB Created: 2020-08-21 05:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35d5c45bc15f10868c70c99021114514 SHA-1: fdbbb1d79f0bb1673b5832acec4c05406717f464 SHA-256: 80829fb17e3872cf7d9e727156cd6affb4ee433527589d0f3e586938ac8a12e1
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link redirects to `ttraff.com`, a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to lure users to malicious sites. 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.com/pify?keyword=clock+faces+worksheet+year+3
    • http://files.mexitem.com/uploads/1/3/2/7/132710678/6740723.pdf
    • http://files.certcpr.com/uploads/1/3/0/7/130739684/zekituwubezitatu.pdf
    • http://files.artofceremony.co.uk/uploads/1/3/0/7/130738806/175cacbb1fee7e2.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8136/files/76776280879.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2722/files/model_cerere_concediu_odihna_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/faxad.pdf
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/merge_sort_recursion.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/jajafoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/d_d_bestiary_5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7032/files/29593103308.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9265/files/knee_and_ankle_strengthening_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/8011238126.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/53933435079.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_off000059b3.bin
f677a106ebc45e748fc622fce219f0120b5028d6a58857d7f7a176f80c947a0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x59B3 5296 bytes
font_01_sfnt_off00006bc1.bin
dfd279121a2e0cf34360fc9bcd026bad8253df0b66d684c1b338f5003589e327
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC1 10412 bytes