Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5ca4536082ad61…

MALICIOUS

PDF

44.4 KB Created: 2020-08-11 07:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7cf0466c3fffac0b7c7e8e3a7d47a96 SHA-1: b9be8d55c5d152ac90507c2fc932b704bef5d5f0 SHA-256: 4a5ca4536082ad613031f83d983790461b4f009559a532f551939ee4199fc8b9
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'Bmw i3 accessories pdf'. This link, 'https://ttraff.cc/pify?keyword=bmw+i3+accessories+pdf', is designed to lead users to malicious infrastructure. The document also contains a large number of external PDF links, many hosted on cdn.shopify.com, which is indicative of a link farm used for SEO poisoning or to obscure the final malicious destination. The ML classifier strongly supports the malicious verdict.

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=bmw+i3+accessories+pdf
    • http://files.jangraypianoartstudio.com/uploads/1/3/1/4/131410370/8497070.pdf
    • http://files.thsfrenchexchange.com/uploads/1/3/1/4/131437005/sosira_zixawot.pdf
    • http://files.westfieldhighschoolgirlsicehockey.com/uploads/1/3/1/3/131398139/258ec0e44c.pdf
    • http://files.floridafundraiser.com/uploads/1/3/0/8/130873851/87b15e9ab8f0835.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/list_of_all_30_nba_teams.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/baudrillard_simulacra_simulation.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/30206575278.pdf
    • https://cdn.shopify.com/s/files/1/0431/5634/0890/files/dekomozumozujiwujadafal.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1561/files/94972460839.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/building_construction_book_by_mckay.pdf
    • https://cdn.shopify.com/s/files/1/0428/2528/5791/files/31167832329.pdf
    • https://cdn.shopify.com/s/files/1/0427/5663/6828/files/88655536007.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/juxudemejarotanifokekoxed.pdf
    • https://cdn.shopify.com/s/files/1/0432/4202/9215/files/anaphylaxis_management_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2949/files/55200187342.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/wamoradowum.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_off00006fd6.bin
a8c0cda7f9f1db68ee896cd9e2d04a1338dfbf9f739cdec304e270a9a54db0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD6 5576 bytes
font_01_sfnt_off000082b3.bin
2d0427f7d62a93c2ed05a0007d36947ee2b42b74fc4a6c3cae3bb1b67485471e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B3 9888 bytes

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