Malicious PDF — malware analysis report

Static analysis result for SHA-256 474d99e45d1100a9…

MALICIOUS

PDF

46.1 KB Created: 2020-07-14 06:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3731343599f45873749f432c150881c2 SHA-1: aea0b993d78e3b9cc89c3feb70910b563f4c82a3 SHA-256: 474d99e45d1100a925c2beddb851db1a44f16eb102c003403a51f13109a7502e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, likely intended to obscure the malicious destination and potentially engage in SEO manipulation for phishing. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the primary attack vector is the malicious redirection via embedded URLs.

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/wb?keyword=sample%20postnuptial%20agreement%20pdf
    • http://files.crumblesbynicole.com/uploads/1/3/1/3/131380596/3902028.pdf
    • http://files.bellvillerent-all.com/uploads/1/3/2/7/132740743/9014582.pdf
    • http://files.warwickvalleywrestling.com/uploads/1/3/1/4/131406369/sezudal.pdf
    • https://kagowujaludu.files.wordpre
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55166802931.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/12966977244.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/voxusurijirovijux.pdf
    • https://cdn.shopify.com/s/files/1/0428/1748/7011/files/fujoje.pdf
    • https://kagowujaludu.files.wordpress.com/2020/07/dazupafuvozusazejizufanif.pdf
    • https://vegumakelaj.files.wordpress.com/2020/06/sizulanujuzozijodu.pdf
    • https://lexaxawo.files.wordpress.com/2020/07/lemanolupujikos.pdf
    • https://zomanowudive.files.wordpress.com/2020/06/21880236611.pdf
    • https://xibupipoj.files.wordpress.com/2020/06/famazudaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/46225450897.pdf
    • https://cdn.shopify.com/s/files/1/0433/4089/0262/files/71348236889.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/fubibujoraz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/48148861279.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wimuwukewamofese.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/xoxewunenigoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/89838841704.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_off0000773d.bin
535a0384faf8e84b972f0dede4bdc5002e09ec735ac24562d2e02399a21b3854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773D 5348 bytes
font_01_sfnt_off00008946.bin
cb38d168aaaaba7a09e19491aa2b47ecd1b5db83ecf80934dbf28b018303202c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8946 9852 bytes

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