Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0a318e98da4168…

MALICIOUS

PDF

48.7 KB Created: 2020-08-15 06:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22574dedd85c3d0d0d7a77d2053fd17f SHA-1: e372ddf4d1a0941ab9c38c2f92af7055a80325c2 SHA-256: cb0a318e98da41688a54ce5373ea3704f1ddadbe242568f0fa9387104c28f298
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. This URL is used in conjunction with a keyword suggesting a lure for sensitive information. The document also exhibits a PDF link farm heuristic, with numerous links pointing to Shopify-hosted PDFs, likely for SEO poisoning or to obscure the primary malicious redirector. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector 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.ru/pify?keyword=audit+assistant+interview+questions+and+answers+pdf
    • http://files.woodburyhistorysociety.co.uk/uploads/1/3/0/7/130739525/zegadexubodeje-xijikis-bubuto.pdf
    • http://files.audrashouseofcakes.com/uploads/1/3/2/7/132740804/wibuzidunigep_girusativode_lirimurefuwo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/nodutuzupanapuboze.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/49097818130.pdf
    • https://cdn.shopify.com/s/files/1/0434/6481/8838/files/rixomojimuzes.pdf
    • https://cdn.shopify.com/s/files/1/0440/0365/5830/files/free_weight_loss_meal_plans.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/zokanajizof.pdf
    • https://cdn.shopify.com/s/files/1/0432/6414/7609/files/monstrous_arcana_the_illithiad.pdf
    • https://cdn.shopify.com/s/files/1/0434/6596/5718/files/fidudatolonamegugezavuvuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/3657/1808/files/95994960279.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/judicial_internship_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8622/files/pofitiluwepifom.pdf
    • https://cdn.shopify.com/s/files/1/0430/4034/2169/files/telugu_movie_apps_for_android.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_off000073c7.bin
7dacffd24bd777dc84e8911ef8d2f40f9dca160d9825a136306ada89909e2ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C7 5152 bytes
font_01_sfnt_off00008568.bin
57df1bcf544bdbeceb65f5bed677ed65f4c3616e9d52275b720251503c5de0e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8568 9996 bytes
font_02_sfnt_off0000a796.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA796 4324 bytes

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