Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4703c7d707c649…

MALICIOUS

PDF

43.0 KB Created: 2020-08-19 10:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c780b07ae872c55f0f762fa5f007afbb SHA-1: b3ee3486bbe91bc89b01e723b85aa1a3bcf77a73 SHA-256: 6a4703c7d707c649c445f83b1214b94fdde17ecfd63ff79cf42cacec142b63de
154 Risk Score

Malware Insights

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

This PDF document contains a link to a known malicious redirector, ttraff.ru, which is likely used to host phishing or scam content. The document body, though obfuscated, contains the text "Authentication problem android phone" and a URL that aligns with the malicious redirector. The presence of numerous other links to Shopify-hosted PDFs suggests a link farm or SEO manipulation tactic to increase visibility and traffic to the malicious URL.

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=authentication+problem+android+phone
    • http://files.autisticadults.com/uploads/1/3/1/6/131637043/sizonokemademu.pdf
    • http://dosigudit.mys4.org/uploads/1/3/0/7/130776525/8c8916f92630be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/27192316602.pdf
    • https://cdn.shopify.com/s/files/1/0431/0201/1548/files/past_simple_regular_verbs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/1795/9586/files/5000_frases_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fejekav.pdf
    • https://cdn.shopify.com/s/files/1/0429/3964/6108/files/good_discord_server_rules.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97046042130.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6490/files/automatic_identification_methods.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/58607442842.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1513/files/alone_movie_video_song_hd.pdf
    • https://cdn.shopify.com/s/files/1/0437/7211/7141/files/62459073484.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_off0000686a.bin
adf08b637e510c4ca3c376261bda56c7f6b0cb6527607de40b6d99576829b2f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x686A 5264 bytes
font_01_sfnt_off00007a0d.bin
729c41a676ac2e2d2c2004d1ffd8543602786cdaa8126870c0d774769797d9d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0D 10880 bytes