Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4560c45d1e175cf…

MALICIOUS

PDF

41.2 KB Created: 2020-08-19 01:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de04c695419decffb7527349d7cc5356 SHA-1: 92298830d9b9ad0af0894f8fdd8aac7581e4030b SHA-256: a4560c45d1e175cfd04570c0f7dbfdffceecbf843e6084c82f1860ea6639996a
128 Risk Score

Malware Insights

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

The PDF document contains text and embedded links that mimic a legitimate business communication, specifically a 'Request letter format for purchase order amendment'. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=request+letter+format+for+purchase+order+amendment', is identified as a malicious redirector. The PDF also contains a large number of other embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The combination of the lure text and the malicious redirector indicates a phishing or social engineering attack aimed at tricking users into visiting a harmful site.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=request+letter+format+for+purchase+order+amendment
    • http://files.alexanderlawes.com/uploads/1/3/0/8/130814258/6268491.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/2189050531.pdf
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/remikewajuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/1480/7974/files/leyendas_de_las_calles_de_la_ciudad_de_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0134/files/voniginowofikerurepivif.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/tebilivudupebex.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/25382839662.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/gikuvibadig.pdf
    • https://cdn.shopify.com/s/files/1/0438/6743/9264/files/67265082437.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/mechanical_engineering_projects_list.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_off00006131.bin
f996eec687fff702cb99990f931d5dd4f74ce13a444670165f4662c749ae225d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6131 5528 bytes
font_01_sfnt_off000073d1.bin
e633cc27df0683ce05766d11ff1e6b030f70ac5ceaad9dcfa2eea00788a3dab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D1 10632 bytes

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