Malicious PDF — malware analysis report

Static analysis result for SHA-256 613f59af2655b9f4…

MALICIOUS

PDF

41.6 KB Created: 2020-08-16 22:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1357c584413d5700be2af4810f966f4e SHA-1: fcc2d9e210f74031e495bd2c34af30f3cd3353c8 SHA-256: 613f59af2655b9f431986442a5cc96a0aff44ee908279ebafba377bf6ce8ebaa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector URL disguised as an answer key for a game, which is a common SEO poisoning tactic. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an attempt to drive traffic to malicious infrastructure. While the document body is heavily obfuscated, the embedded URL and heuristic findings strongly suggest a phishing or redirection attack.

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=pictoword+level+160+answer+key
    • http://files.usitns.com/uploads/1/3/2/6/132682882/4908066.pdf
    • http://gekiralo.noreencoup.com/uploads/1/3/1/0/131070161/991762.pdf
    • http://feboku.solvibrationstravel.com/uploads/1/3/2/6/132682883/rulis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/38828375900.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62856854762.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9696/files/estres_en_el_ambito_laboral.pdf
    • https://cdn.shopify.com/s/files/1/0431/0663/1833/files/l_analyse_de_la_boite_a_merveille.pdf
    • https://cdn.shopify.com/s/files/1/0430/0819/6767/files/dutexabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdf
    • https://cdn.shopify.com/s/files/1/0447/2376/5402/files/17325174920.pdf
    • https://cdn.shopify.com/s/files/1/0432/3396/8287/files/41784756224.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/57214923196.pdf
    • https://cdn.shopify.com/s/files/1/0437/6441/6661/files/rimibamijeravujoxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6406/files/40482050816.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_off000063c2.bin
5148583b2ab6b4e7ac57db873aa16d4c6e802fb50af1e2599c677fb0ca63b208
pdf-font-stream PDF embedded font (sfnt) at offset 0x63C2 5600 bytes
font_01_sfnt_off000076f3.bin
19587d7ab04951dfd7e871dfb6c5fc440f8d1e72014224c902fd62fc4d47bb63
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F3 10112 bytes