Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ef9a1ebdc8bb3a…

MALICIOUS

PDF

48.9 KB Created: 2020-07-19 21:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1faaaaff99e1cf400d17d50f927887e1 SHA-1: 5dfcd443994865828d97bf60232048247c4f491f SHA-256: 85ef9a1ebdc8bb3a0d60c2720477b4a55f96f0a8b8e30dccc5459d237ae99065
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, with the first being 'lorirosoxaxe.files.wordpress.com/2020/06/vozasuwotuvime.pdf'. The document body, though heavily obfuscated, suggests a lure related to 'geometry proofs worksheet with answers'. The combination of these factors strongly indicates a malicious redirector and link farm attack.

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=geometry+proofs+worksheet+with+answers
    • http://files.amselectric.com/uploads/1/3/1/3/131379134/topagijoxod.pdf
    • http://files.volusiaschoolcounselors.org/uploads/1/3/1/4/131453559/puvononufuzezekuvuni.pdf
    • http://files.gaindetalks.com/uploads/1/3/0/8/130874629/dojoja-kefuzegomoli-wadab.pdf
    • http://files.theazphoenixsoldiers.com/uploads/1/3/1/0/131070604/gujolezenofotidexa.pdf
    • https://lorirosoxaxe.files.wordpress.com/2020/06/vozasuwotuvime.pdf
    • https://vovuzugola.files.wordpress.com/2020/07/42548709242.pdf
    • https://tuxukem.files.wordpress.com/2020/07/pudowogiperotigug.pdf
    • https://maforebe.files.wordpress.com/2020/06/kosisab.pdf
    • https://dinipexus.files.wordpress.com/2020/06/koninomulelukawarasozasuz.pdf
    • https://zazizoko.files.wordpress.com/2020/06/83203434730.pdf
    • https://lililizita.files.wordpress.com/2020/06/91574521061.pdf
    • https://xejolaxutibu.files.wordpress.com/2020/06/peragidaxajemukagi.pdf
    • https://kapavefewo.files.wordpress.com/2020/06/68555239148.pdf
    • https://ximajisifije.files.wordpress.com/2020/07/tovavelagisojaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0626/files/74369123112.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0437/2017/9864/files/katepozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/60016419066.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6048/files/xurinosikepomuvewobama.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/lalunor.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/lesamegokolizoxufalax.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_off00006b7a.bin
9f4a66f709b20b41b13aa1200e9571437a8a32126392311b3b79c0695b4b4234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7A 5188 bytes
font_01_sfnt_off00007d12.bin
ab4719014c67cdeaab20b69930ca1eff07883387782faa01cdf1df51e84bb196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D12 10324 bytes
font_02_sfnt_off0000a085.bin
b2ac67756ccb9a38f0303b1ba820cb5c8b4ab6133599e7fd07ad9e712984a954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA085 16168 bytes

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