Malicious PDF — malware analysis report

Static analysis result for SHA-256 43783db03dd79413…

MALICIOUS

PDF

34.9 KB Created: 2020-08-31 04:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1312ed96840a540fb588a38ddfcccd9 SHA-1: b61357c18ddd05d08103492cf3491724321d782c SHA-256: 43783db03dd794138d4cf49217fd610f75eb6bb1880563ffd7f8549cb377284b
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains multiple embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wix?keyword=lego+star+wars+3+gba+rom', which is presented as a search result for a game ROM. The document also exhibits characteristics of a PDF link farm, with numerous links pointing to various PDF files hosted on Shopify and other domains. No scripts were extracted from this sample.

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/wix?keyword=lego+star+wars+3+gba+rom
    • https://cdn.shopify.com/s/files/1/0433/8008/0801/files/betplay_apk_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5190/files/apa_website_citation_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/73150210706.pdf
    • https://cdn.shopify.com/s/files/1/0437/3561/3594/files/peekaboo_game_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/zavexumexukotegimoz.pdf
    • https://static.usrfiles.com/ugd/de02f3_9d49e0df6460462ab8b307a370476284.pdf
    • https://static.usrfiles.com/ugd/3e5d97_90281a3ea1ac4f9db6a6794ba87861e3.pdf
    • https://cdn.shopify.com/s/files/1/0428/4930/4742/files/sepogijeragab.pdf
    • https://cdn.shopify.com/s/files/1/0431/5319/5157/files/19556516227.pdf
    • https://cdn.shopify.com/s/files/1/0439/1541/1608/files/35016318145.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/7006521621.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/bupek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000404b.bin
98dfa94784696df44a97ff3fc6377c8cfb989e50953b2fa58ecec15cf86f059a
pdf-font-stream PDF embedded font (sfnt) at offset 0x404B 4944 bytes
font_01_sfnt_off00005132.bin
bdcba6fba3d01cd1218e91d5f8a25937bf41187b9fd260dc828ed551842e2450
pdf-font-stream PDF embedded font (sfnt) at offset 0x5132 9276 bytes
font_02_sfnt_off000070fc.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x70FC 4324 bytes