Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fba4170abb6836…

MALICIOUS

PDF

51.8 KB Created: 2020-08-16 20:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ad42683ebb4ae336fb6583956009a87 SHA-1: bea69639ef29a1c59b408e9d9562864a73d598a7 SHA-256: 92fba4170abb6836a683fdb5192170439432ba3d4d264b07fe69786c4b401737
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links directs to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious content or obfuscation techniques.

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/pify?keyword=hollywood+thriller+movies+tamil+dubbed
    • http://files.trevormlewis.com/uploads/1/3/1/3/131381919/kebesejefixuw-linutozamame-masaxu-sosutabir.pdf
    • http://mabizele.beautytipsandcollections.com/uploads/1/3/0/7/130738731/garulaso.pdf
    • http://files.eeclockhart.org/uploads/1/3/1/1/131164211/jaxige.pdf
    • http://povetuza.stpaulsabers.com/uploads/1/3/1/3/131398459/831070.pdf
    • http://files.wisdomoftheages.biz/uploads/1/3/1/3/131398253/7070521.pdf
    • https://cdn.shopify.com/s/files/1/0431/6017/4754/files/masojaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/9013/files/cntico_de_las_criaturas.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/27580540201.pdf
    • https://cdn.shopify.com/s/files/1/0434/4591/1709/files/43421927673.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1973/files/45380248267.pdf
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/antifungal_agents_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/zorulasapegolomamelijuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/75916660844.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/siduwiwadubaresesibejo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/collocation_dictionary_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/biocenosis_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0434/3300/1126/files/cma_study_guide.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_off000074a7.bin
e53a5900cb40aabb8a6fb9d14294f9fe1a93b677b5dbb5ea22424e9a0e4d9e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A7 5420 bytes
font_01_sfnt_off000086fe.bin
5afd876191daf0222f9322174a2ff4acef93f92971cc909600ae5ecf20488ef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FE 8944 bytes
font_02_sfnt_off00009f8f.bin
5bf7a521e5fdfbdd07a75ad4ef339b4b3ba0cc4b90e28cbd4b9ec897db6b4486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F8F 9912 bytes

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