Malicious PDF — malware analysis report

Static analysis result for SHA-256 66552cf6efb9f04c…

MALICIOUS

PDF

67.8 KB Created: 2020-08-18 20:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1610307cc98bd42b8b71d12f423136f SHA-1: 5b7694eb9fa06c6158263988cbb587ef91edc945 SHA-256: 66552cf6efb9f04c9a88bebb266a237a7c61de6ec19d4105921d6af7402583e9
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting it is a manual for an Audi Q5, which is likely a lure. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO manipulation or distributing malicious content. No scripts were extracted, but the primary malicious activity appears to be redirecting users to a potentially harmful 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=manual+instrucciones+audi+q5+2016
    • http://files.mariannewardart.com/uploads/1/3/0/7/130775361/piforatoziwok.pdf
    • http://files.fusaroconsulting.com/uploads/1/3/1/1/131163635/posejax_joguv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3576/1562/files/free_printable_certificate_of_achievement_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/73792052170.pdf
    • https://cdn.shopify.com/s/files/1/0441/2869/8520/files/ceruleum_field_ffxiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/fujofaniturigu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/powokotaruwetuxurag.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/automatic_transmission_gearbox.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/fuzuwudaki.pdf
    • https://cdn.shopify.com/s/files/1/0428/2908/6876/files/weragidi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab00.bin
59f7bf12ff288d927c09f1d04a87575b4d12ec1bf129124fd67b986d950a0be5
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB00 5668 bytes
font_01_sfnt_off0000be5e.bin
aaccca40f480302b1415064b745369c35688b43948dd3e184e60a29de9520d85
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5E 14824 bytes
font_02_sfnt_off0000ed24.bin
84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727
pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16060 bytes