Malicious PDF — malware analysis report

Static analysis result for SHA-256 3626a2f5df98f30a…

MALICIOUS

PDF

49.3 KB Created: 2020-08-22 18:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbc2da802243be6c7b075a7cce2d0857 SHA-1: a8108d871dd337ae9052ec774f53f1c54665bd30 SHA-256: 3626a2f5df98f30ab9d207a456fccbb451df7b4291121aeb9022790373fd4211
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to 'https://ttraff.cc/pify?keyword=risk+assessment+format+xls', suggesting a lure for users to download potentially malicious content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The ML classifier strongly indicates 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.cc/pify?keyword=risk+assessment+format+xls
    • http://files.acupuncturevegas.com/uploads/1/3/0/7/130775331/467ffb69cc6673.pdf
    • http://files.zion-cobleskill.org/uploads/1/3/1/6/131636678/22ac99b9b.pdf
    • http://nazov.mypatternbreaker.com/uploads/1/3/2/6/132682883/wozizasirotakovo.pdf
    • http://xifebi.mindspringhempco.com/uploads/1/3/1/0/131070858/b69b0a202.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/tuzasonenurewisuzuko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0766/files/17561581177.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/22100519275.pdf
    • https://cdn.shopify.com/s/files/1/0430/5407/1957/files/kemuxogazomazafobigobi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/passive_voice_questions_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/invitation_to_oceanography_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/5713/6294/files/difapowamigidubobuwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2890/6138/files/46201910370.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7669/files/druid_dnd_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/57946325250.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/29793181617.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7555/files/university_of_chicago_booth_mba_employment_report.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008316.bin
d0357256f80ec39a172c8135e76acacaf0e60a5943c4c06f867bca9599d5fb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8316 5052 bytes
font_01_sfnt_off00009435.bin
ad6766056a0e4a81447a3da1b486104467fbeb2c42eed4c36828ce495464352e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9435 10540 bytes

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