Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e34faa7398e70a3…

MALICIOUS

PDF

40.1 KB Created: 2020-08-20 09:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1987370f26510c8c4710cf7813f3c28a SHA-1: d0496e5dbaf7b2b48dacd3a32fbc9671e86d4b59 SHA-256: 6e34faa7398e70a35d8b18c65b7f236536dbfb837db013d92114fd29bcd1aaf2
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, including a primary redirector to ttraff.ru. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users interested in essay formats. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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.ru/pify?keyword=strengths+and+weaknesses+essay+format
    • http://files.enelectuas.com/uploads/1/3/1/1/131164488/tuporugosusukeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/63106896263.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/xapukabu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/wivikofarizuwogufepojadi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3305/8715/files/lawyer_business_card_psd_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/ghost_recon_breakpoint_game_informer_review.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3005/files/tisimefadi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/adobe_photoshop_cs6_cracken.pdf
    • https://cdn.shopify.com/s/files/1/0429/3751/6191/files/88182948604.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3141/files/kitchen_vocabulary_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7786/files/bhagavad_gita_shlok.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_off00005db2.bin
124c9dc07e70485a5cd5745d094ea8891b8a1cedace6e74e48c46e2138ed6d24
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB2 5648 bytes
font_01_sfnt_off000070da.bin
04bf86c84a7173cbf1014da3364c72aec49230fc501c45e81ed14259ca5c221e
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 10268 bytes