Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61e0920a5ecf26c…

MALICIOUS

PDF

40.8 KB Created: 2020-08-21 13:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f803ac21532842e5e777b9c3b0f1182c SHA-1: b2245fa12434915b2e2fc3d0d1e425b352e6501c SHA-256: b61e0920a5ecf26cf5b2f70aa9f5c3283c28721e05691f91104bfec4562b4a44
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, forming a link farm. One prominent link, 'https://ttraff.ru/pify?keyword=bakery+story+mod+apk+free', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'bakery story mod apk free', suggesting a lure to download a modified application. The ML classifier strongly flagged this PDF as malicious.

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=bakery+story+mod+apk+free
    • http://fegaguz.rodneyhowellcollection.com/uploads/1/3/1/3/131383386/3411060.pdf
    • http://lebawo.maconmilestones.com/uploads/1/3/1/3/131379833/4198808.pdf
    • http://files.gabrieldubreuil.com/uploads/1/3/1/3/131398351/pogebusezawapegor.pdf
    • http://podutegag.kpotterfineart.com/uploads/1/3/1/4/131410812/sunepimofupete-buvebotow-soxobowegimup-rulin.pdf
    • http://wamupukuv.soulherpower.co/uploads/1/3/1/4/131408791/nobebexaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nujogopuju.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/feruziluxebejakofeluleda.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/rukagotepavu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/21517146599.pdf
    • https://cdn.shopify.com/s/files/1/0434/1615/8359/files/folebapemorefixigef.pdf
    • https://cdn.shopify.com/s/files/1/0428/7361/8599/files/south_western_federal_taxation_2014_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/83711485078.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/48658070216.pdf
    • https://cdn.shopify.com/s/files/1/0437/5828/9045/files/xiwutufonugadefiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/4565149903.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/gugusa.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_off00006385.bin
5ea36b85885a610164aa5fe306a5a4b4a420573414c531b2517d5d39016f98d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6385 5368 bytes
font_01_sfnt_off000075c5.bin
9af10c9cbc329d3af0c572cfa471f04ec2ba4e231e5164158f01b3fb166ebbe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x75C5 9616 bytes