Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c51aa9175d20ff…

MALICIOUS

PDF

40.7 KB Created: 2020-08-15 00:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3480682f56b2fd60c3f3b6ae294d7cf8 SHA-1: ef76d6687925569bd93a0b14e51041b6d00e0889 SHA-256: 98c51aa9175d20ff0cc8ffdd2fd43fff3ffc5393f703da4807fcb21e7c9c5d50
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains numerous embedded URLs. One of these URLs, 'https://ttraff.ru/wb?keyword=english%20marathi%20oxford%20dictionary%20pdf', is flagged as a known malicious redirector. The document also exhibits characteristics of a PDF link farm, with 30 external PDF links, many pointing to Shopify domains, suggesting an attempt to manipulate SEO or distribute content through a large number of seemingly legitimate but controlled links. No scripts were extracted from this sample.

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=english%20marathi%20oxford%20dictionary%20pdf
    • http://files.wkuprecollegepiano.com/uploads/1/3/0/8/130813528/munelavupaf.pdf
    • http://files.twistedpantry.com/uploads/1/3/1/8/131872269/fakavasa.pdf
    • http://files.irminenschaft.org/uploads/1/3/0/8/130814258/dimizatizasuxu-bipofosa-zimadul.pdf
    • http://files.staceydrago.com/uploads/1/3/1/8/131871951/190565.pdf
    • https://cdn.shopify.com/s/files/1/0437/3967/6821/files/difference_between_budgetary_control_and_standard_costing.pdf
    • https://cdn.shopify.com/s/files/1/0435/3897/2831/files/38653997032.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8073/files/onan_generator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/itunes_says_my_billing_information_is_wrong.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/tiginoloxozu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7478/0312/files/98064481983.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/54907461372.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8402/files/46429551871.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5626/files/56444679708.pdf
    • https://cdn.shopify.com/s/files/1/0455/7858/4229/files/invitation_templates_for_sport_event.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/zivenasugizewufevi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053bc.bin
2f6bf5a5a54e72a0a17fa6eaa67eed983b6dd9c7149ece45cdc839beaca69475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53BC 5696 bytes
font_01_sfnt_off000066f6.bin
cf885e6d0d70d41ce58c11bd65e132f527ce0cd03431142cebd5137354436c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F6 9832 bytes
font_02_sfnt_off000088d1.bin
4b40f117a074286f5d74a1d6a7bd7b036d46460c5a63aaa3d9dabf8b19ea629d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D1 3252 bytes

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