Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd924b493097c73…

MALICIOUS

PDF

43.6 KB Created: 2020-08-22 00:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2ce3f3dd5c8fc2e3a3f06cc97efd2fc SHA-1: 7462531a23a9a19123d4ab00afea998e67c05148 SHA-256: dcd924b493097c737c552f047c4fa4db5209406d88c78119412bdf27bd43f3ee
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to external PDF files. One critical heuristic identified a link to known malicious redirector infrastructure (https://ttraff.cc/pify?keyword=barrister+reality+album). The document body contains garbled text but also includes the same malicious redirector URL and several benign-looking Shopify URLs, suggesting a link farm or SEO manipulation tactic. No scripts were extracted, but the sheer volume of links and the presence of a malicious redirector indicate a high likelihood of malicious intent, possibly to lead users to phishing or malware download sites.

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=barrister+reality+album
    • http://dagivaziv.infinitylivinglockets.com/uploads/1/3/1/0/131070674/wubadividaxumoxutive.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/barbie_cartoon_movies_free_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0433/8165/3655/files/gewipojelodep.pdf
    • https://cdn.shopify.com/s/files/1/0437/4164/2906/files/70016747873.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/tefun.pdf
    • https://cdn.shopify.com/s/files/1/0437/9554/6273/files/attestation_employeur_particulier.pdf
    • https://cdn.shopify.com/s/files/1/0438/2588/9442/files/desh_bhakti_song_video_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/99939961456.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xajubebajodefemun.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/71796226382.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_off000064cd.bin
a2b374579b2dc75d90ada10d744672d543c9d9ef4c2958b6c06da05401ac85a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x64CD 5120 bytes
font_01_sfnt_off00007624.bin
8a5c119f6d0288024e964a1ecfb0ae0ce3c5207afc75bab73e2f200b7a97e45b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7624 14008 bytes