Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f7a77209dfc4f4…

MALICIOUS

PDF

40.7 KB Created: 2020-08-24 00:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9384458ebd61ae553d284dafcff2a60f SHA-1: f75c8d8be4444f9af67f3d9d90929dcba47416cc SHA-256: 16f7a77209dfc4f473c5b1d6e7cb07bcbb90d404e2e422a9358ec1086783929e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, including a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=video+from+site+safari'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or content hosting strategy. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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=video+from+site+safari
    • http://files.mbtaiji.net/uploads/1/3/0/8/130873851/1363479.pdf
    • http://files.reikifortheplanet.com/uploads/1/3/2/3/132302815/5645773.pdf
    • http://files.poppyavenueboutique.com/uploads/1/3/1/1/131163914/dozixudawux_panajuzopivixo_sexirekafa_somirubugupor.pdf
    • http://xopiselon.carolguzman.com/uploads/1/3/0/8/130874422/3146600.pdf
    • http://files.joannasholistictreatmentclinic.com/uploads/1/3/1/4/131438274/0a14f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0049/4237/files/kewelonagosexafoloje.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/problem_solving_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/radasibemi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/43307624111.pdf
    • https://cdn.shopify.com/s/files/1/0437/4655/8106/files/55481291024.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/19549849167.pdf
    • https://cdn.shopify.com/s/files/1/0433/5363/7018/files/zinobeloj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2987/3318/files/38451204137.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6117/files/93393429997.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c8.bin
8f0a171fd742e1490deedd34e423cc5135eaf703127129a3f3182080aa5e85f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x63C8 4988 bytes
font_01_sfnt_off000074a6.bin
34add20e4ad6b5eeb6a59f3abaa89910ca3003977184634f8fa83736c0796bb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x74A6 9868 bytes