Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1be22afc8e6db30…

MALICIOUS

PDF

116.2 KB Created: 2020-09-02 13:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf99cd80c6cf063a31077c80db6caf6 SHA-1: 767a3beffe3134040f28d2859a1ee04a737169be SHA-256: f1be22afc8e6db30c11a50ff0e215250da5f0c2627d1ff4a3f0c08bc4f2e0787
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector (ttraff.ru). The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary purpose is to lure users to malicious sites. The presence of a link farm indicates a potential attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=ayyappan+padal+tamil+songs
    • https://cdn.shopify.com/s/files/1/0430/4607/6565/files/32288105231.pdf
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/loan_agreement_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/nokepofibexevidonikujavu.pdf
    • https://static.usrfiles.com/ugd/40512e_19c6e0df7a434fd4ba11833ef40a5e00.pdf
    • https://static.usrfiles.com/ugd/df4650_6bf34063702b4f769d309806609424cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_fef08631cb184895a3de57d13cc79efe.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d36ad4f4c1c4257b090c35f4933a16f.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/lerosetuviguf.pdf
    • https://cdn.shopify.com/s/files/1/0450/3843/6516/files/jifik.pdf
    • https://cdn.shopify.com/s/files/1/0432/0005/3408/files/ziwijinuvuxevirodavezuxir.pdf
    • https://static.usrfiles.com/ugd/a2d007_cb4fbd0051554c7aade558046e883457.pdf
    • https://static.usrfiles.com/ugd/f46427_01d089d2e036462da70daa800694560e.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001419c.bin
1f704321da6c9533394e3daca62f4c9b2d8e087e2f11655debdc550516026f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1419C 3012 bytes
font_01_sfnt_off00014c64.bin
a7e375b396df3bd4118b211161b43fc85be62ec2b74ac23ee617cea7abee8915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C64 5276 bytes
font_02_sfnt_off00015e53.bin
3cb9aae2d85006cf001e334097d1b8faa1277bc3fc3cce8806f8dcf639bcc0a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E53 14212 bytes
font_03_sfnt_off00018176.bin
abcec9cd45bee11a439a4aa93fe556c024d9a3bb9ff093c310b9fb2bc7e0b37d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18176 14480 bytes
font_04_sfnt_off0001ae63.bin
43254c6337662e76ed67025008a42d76121bee43b935a85a5f582473253d5118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE63 16096 bytes

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