Malicious PDF — malware analysis report

Static analysis result for SHA-256 939537cd6fa63c1f…

MALICIOUS

PDF

89.1 KB Created: 2020-08-12 17:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc02d51b92bb19bb834c0e26fa13e93b SHA-1: cbb3420eeda759de1239eda8d2a037a86d3decf1 SHA-256: 939537cd6fa63c1f1f816e83b273cdef41accfcec09c5d827b72823519738954
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wb?keyword=oedipus%20the%20king%20script%20pdf'. Additionally, it features a PDF link farm with numerous external links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the same redirect URL.

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.cc/wb?keyword=oedipus%20the%20king%20script%20pdf
    • http://wipudo.redshift-consulting.com/uploads/1/3/0/7/130739591/mozosedeteb.pdf
    • http://files.raphaelhirsch.com/uploads/1/3/1/8/131871605/9133790.pdf
    • http://files.michelamclaurin.com/uploads/1/3/1/3/131381363/vezoposori.pdf
    • http://files.angeliquelarson.com/uploads/1/3/1/4/131437685/lujopujakif.pdf
    • http://files.yassvalleyk9.com/uploads/1/3/1/3/131380848/tuxidej-kokufejujibage.pdf
    • https://cdn.shopify.com/s/files/1/0447/8110/9405/files/structured_problem_solving_process.pdf
    • https://cdn.shopify.com/s/files/1/0440/7453/3014/files/14623125545.pdf
    • https://cdn.shopify.com/s/files/1/0435/5063/8241/files/rifesovifabibubutet.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/12916854593.pdf
    • https://cdn.shopify.com/s/files/1/0429/2562/1404/files/libreoffice_import.pdf
    • https://cdn.shopify.com/s/files/1/0431/3156/8290/files/jugikapuxelifamirezota.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3870/files/tokipusijubolipolig.pdf
    • https://cdn.shopify.com/s/files/1/0437/2214/5943/files/61518798015.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/rilakevimiwowewuber.pdf
    • https://cdn.shopify.com/s/files/1/0439/2773/2379/files/semi_structured_interview_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/94739789175.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2240/files/jikiketod.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/
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001222a.bin
cb1a43d84f6310c8eb95b46f0c2fc27edc9c1a09d78f4d58f0f2daa2718b651b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 5264 bytes
font_01_sfnt_off0001340d.bin
8decf530ab33939065ada03a93776881904a2a668d31e4a2f8eb269e47cafd5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1340D 10140 bytes

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