Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b3874b3357e271…

MALICIOUS

PDF

38.6 KB Created: 2020-07-08 16:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 396089ab90309ada5d2605a049a7cc21 SHA-1: a356587d1c0134a37ac6274473ba8c20f9c7e046 SHA-256: 99b3874b3357e271b380f9ec7d8a6353a95653a7c142f87c25243b798c91ca77
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF document contains a large number of embedded links, many of which point to redirector infrastructure. The primary link, 'https://ttraff.ru/wb?keyword=garmin%20gpsmap%20740s%20manual', is identified as a malicious redirector. The document body also contains numerous other PDF links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=garmin%20gpsmap%20740s%20manual
    • http://files.yashbangera.com/uploads/1/3/0/7/130738625/83486b04a35.pdf
    • http://files.southtownscatholic.org/uploads/1/3/1/6/131636990/3996155.pdf
    • http://files.elizabethkpetersonlab.com/uploads/1/3/1/3/131384789/sibufajoj-xuvini.pdf
    • http://files.heartofillinoisorff.org/uploads/1/3/1/3/131379371/9586210.pdf
    • http://files.vicenzas-crostoli.com/uploads/1/3/1/4/131483253/9062675.pdf
    • http://files.pickndawg.com/uploads/1/3/1/3/131379115/ca6c7655.pdf
    • http://files.scunthorpedivers.co.uk/uploads/1/3/1/3/131383959/keruxusodetan.pdf
    • http://files.boomingbloomsco.com/uploads/1/3/1/4/131453946/4307245.pdf
    • http://files.zemanmfg.com/uploads/1/3/1/4/131438499/dazife.pdf
    • https://feraponopegi.files.wordpress.com/2020/06/gefiraxutipozagim.pdf
    • https://butekowuz.files.wordpress.com/2020/07/76682330827.pdf
    • https://merixedatox.files.wordpress.com/2020/06/wigoko.pdf
    • https://detorodek.files.wordpress.com/2020/06/mojiwo.pdf
    • https://jibasosubapo.files.wordpress.com/2020/07/zavelokabepebife.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rabilividobakomitunaxizug.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_off00005942.bin
e91444c228eecf309d18cd1c67b102761f59d687fcc495d371ddaaedfa2dac6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5942 5056 bytes
font_01_sfnt_off00006a54.bin
4a4e1d2274e3ab64b820b59757561661a2b7cd02452198ccb18594e4b8e0f1f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A54 10268 bytes

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