Malicious PDF — malware analysis report

Static analysis result for SHA-256 329851dc745c8a3f…

MALICIOUS

PDF

42.7 KB Created: 2020-08-10 09:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de4ad02e2bd6172a620ec911e5fa3944 SHA-1: cef6f41085e257ea82413dcf6a8d2dab715b495f SHA-256: 329851dc745c8a3f2e3b91ba2df7b640380fabb0353aab7e609bb507bcc8fba7
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is associated with the keyword 'forensic accounting pdf free download'. This suggests a phishing or scam attempt. The document also contains a large number of links to Shopify-hosted PDFs, likely part of a link farm to improve search engine ranking for malicious content. No scripts were extracted from this sample.

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=forensic+accounting+pdf+free+download
    • http://nevame.whslionswrestling.com/uploads/1/3/2/7/132710712/7833926.pdf
    • http://files.msgrp.us/uploads/1/3/0/7/130774970/9275943.pdf
    • http://files.littlemisschateau.com/uploads/1/3/0/7/130776500/851284.pdf
    • http://files.bringingtherapyhome.com/uploads/1/3/1/8/131871605/1feb4c7.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/zyxel_c3000z_modem_centurylink.pdf
    • https://cdn.shopify.com/s/files/1/0432/6811/2550/files/how_to_set_up_csgo_1v1.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6027/files/bodurojujovanutowonitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8708/5220/files/lidaxakefepilewujiki.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/9438390391.pdf
    • https://cdn.shopify.com/s/files/1/0431/4644/4960/files/declarative_vs_imperative.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8453/files/historia_clinica_psicologica_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/fopirerelojeworuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/60872149876.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/aoac_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1334/files/ranuvipakatirokosi.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_off00006929.bin
61acfbfe2ae7fae100fc40907bed91ccb57f7de3d26932049c2d6c1e8ff002c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6929 5372 bytes
font_01_sfnt_off00007b94.bin
f730d18c445b75ccb879f005e8f9a4cc2027fcf7152d1f541bf8dcceb8adee30
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B94 10024 bytes