Malicious PDF — malware analysis report

Static analysis result for SHA-256 710f5a075bd9b7f3…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 03:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 525beb0d73bf2057cb185383b6769e26 SHA-1: dcb20adcc09eb60814d9cb0f12ab78b75aee944e SHA-256: 710f5a075bd9b7f3be2922aba74c230e31dfa45562484d27c561fdcbc4d88cca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The file's structure and content suggest it is part of a link farm or SEO manipulation scheme, potentially leading users to malicious sites. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=artorius+the+doombringer+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_230c1e8b6a9d45e997fbecb745af5ea6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0855aecdad9f4b0aa0a1147d93c609aa.pdf
    • https://static.usrfiles.com/ugd/6d59ab_17483c194c39412d9bcc50403208245b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e32925c4c4944104ad021826a9565fad.pdf
    • https://static.usrfiles.com/ugd/0779a3_31cae3d598e94a9c89bce08c9dcf6f76.pdf
    • https://static.usrfiles.com/ugd/b8c837_12aba08e840a499e9130b786897c4b04.pdf
    • https://static.usrfiles.com/ugd/b4a829_6e733bd3ab764dadac8e865834c66515.pdf
    • https://static.usrfiles.com/ugd/913720_21f96579d6ea49168c5ee6d85132d90f.pdf
    • https://static.usrfiles.com/ugd/d162e3_56f8d7b77ef4441890f992ee6b01cec3.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/gate_syllabus_instrumentation_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/13958266666.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/vasubupunugelufufew.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/35631612778.pdf
    • https://cdn.shopify.com/s/files/1/0438/0740/8290/files/guzek.pdf
    • https://cdn.shopify.com/s/files/1/0434/2104/0789/files/51204951806.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0489/files/51381444282.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/wozejakukepinepipokados.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/wimuzuwuvufikinen.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6705/files/guxiwigekeju.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b26.bin
ffc738c054b6b096d32ce9c762f70a59822eb18afec19cde38f4c20dc217b549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B26 5124 bytes
font_01_sfnt_off00007c6c.bin
407be029b31eac55dc3dec09adcaefd364ef47c348cc1b9c818aaa31d994b62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6C 10388 bytes

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