Malicious PDF — malware analysis report

Static analysis result for SHA-256 867e746bd4aa1a19…

MALICIOUS

PDF

40.8 KB Created: 2020-08-13 23:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a37f11a1e17e0cdb4e2986fc600f849 SHA-1: f25f927e41ea13bbc6dd99806d77414c147c2d07 SHA-256: 867e746bd4aa1a19c62fb4c6bc767cb1fffb4b5cce5b605994e5d19327e6c1d1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=hit+the+button+meme+template, which is likely the primary malicious payload delivery mechanism. The presence of numerous other links suggests a link farm or redirection strategy.

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=hit+the+button+meme+template
    • http://files.animalbehaviourconsultantscotland.co.uk/uploads/1/3/1/4/131407178/kukur-zetozure-zikufozin-zezutug.pdf
    • http://files.reedcusterband.com/uploads/1/3/1/1/131163666/de656b5cb928d.pdf
    • http://files.richardreuser.com/uploads/1/3/2/6/132681456/c336422cb4c1.pdf
    • http://jugesin.theopalexchange.com/uploads/1/3/1/6/131606346/xusalakovalaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/area_of_a_circle_questions.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/68144447101.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/fomowesevuvevadubopejid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9656/files/71025650389.pdf
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/football_today_xbmc.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/18204428365.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/27450691807.pdf
    • https://cdn.shopify.com/s/files/1/0452/7574/2370/files/79458606579.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/dell_3110_cn_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5886/4028/files/8080669768.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000634b.bin
dcfbd67555500cd123342f7093cde26b6aa35bf00c3c5c9945a1f8ea939d309b
pdf-font-stream PDF embedded font (sfnt) at offset 0x634B 4888 bytes
font_01_sfnt_off000073b0.bin
b971eea396608c35e246a9a8ff3f40a84528c062747eb0fdb41073cd58767c19
pdf-font-stream PDF embedded font (sfnt) at offset 0x73B0 10288 bytes