Malicious PDF — malware analysis report

Static analysis result for SHA-256 868c2f93057e0df0…

MALICIOUS

PDF

44.6 KB Created: 2020-08-04 03:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55704c5bd1d1a1be370598efe6262085 SHA-1: 382daffa1a9d79999bba825ff98635048594dc51 SHA-256: 868c2f93057e0df0226967e2772239d2fbd8c60f273999403cda4918c0769e86
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary link pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'application form'. The presence of many external PDF links, some benign and some unknown, indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.ru/pify?keyword=c.+a.+o+application+form+pdf
    • http://files.vbtherapist.com/uploads/1/3/1/0/131070469/razekuva.pdf
    • http://betututa.benedictionworks.com/uploads/1/3/1/3/131381078/1073593.pdf
    • http://files.wisewomannaturalhealth.com/uploads/1/3/1/3/131398288/zofevozakivogaduf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/atomic_structure_of_hydrogen.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/xisunojemivuragum.pdf
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/sosopavanosisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9241/0525/files/finedevowudugonamemusefa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/fapotelopu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/43109148909.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/52352672247.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/gezibarijovumuputarag.pdf
    • https://cdn.shopify.com/s/files/1/0436/0847/3763/files/44368098362.pdf
    • https://cdn.shopify.com/s/files/1/0430/9952/1181/files/49004873202.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/ruteniki.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/delutoludokujadokil.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/convert_to_word_app_for_iphone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006417.bin
f633764bca29410cd5b0af9aa670e7534faaa5d83216702046328ab8c618348d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6417 4848 bytes
font_01_sfnt_off00007473.bin
599c3c4d1b8205e1b406f407cd1d65307ad1b16386c69e172176c005ae4b9591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7473 10312 bytes
font_02_sfnt_off00009777.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9777 4324 bytes

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