Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ab443ffe445fb1…

MALICIOUS

PDF

60.0 KB Created: 2020-08-31 22:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19564e28e377aeab7aa0801d7b4f2304 SHA-1: a072546a4e105fefe85a61b02b059551793d11a6 SHA-256: a2ab443ffe445fb1ac03134d10d648993571c483ecfbd925ec91fdbe59f02f89
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body itself is heavily obfuscated but contains the same redirector URL and a list of other PDF links. This suggests the primary purpose is to redirect users to malicious content or to engage in SEO manipulation by linking to a large number of external resources.

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.link/pify?keyword=explain+water+cycle+short+answer
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/attestation_employeur_pole_emploi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2647/files/bimolecular_collision_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0954/files/wotlk_bm_hunter_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/analytical_geometry_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/lamimem.pdf
    • https://static.usrfiles.com/ugd/b91566_e9ba2c45ffa64981943b78a259de182e.pdf
    • https://static.usrfiles.com/ugd/5360f8_a7c8425aeff3476685a8e2f80b3cfd2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_24f7d0fef4b5417e9c7205c9f62d74ad.pdf
    • https://static.usrfiles.com/ugd/3b7182_35a790871308483d83a0b700cd567ab4.pdf
    • https://static.usrfiles.com/ugd/ce5d00_a482d62f7ae6416789020d38ee9e4ed2.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/articles_of_association_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/80471785563.pdf
    • https://cdn.shopify.com/s/files/1/0429/4849/3475/files/rihanna_daimon_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2454/files/epson_sylus_cx8400.pdf
    • https://cdn.shopify.com/s/files/1/0458/2368/8867/files/5850249947.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_off00009fe8.bin
c6017286b52026b1b560be460eacbd491668e3eb39f97517cfe48cddc3e6ff21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FE8 5028 bytes
font_01_sfnt_off0000b106.bin
91000ed353fdb907182ba0a2858e1125608a57b83e51dd46e6ed02e3faccc4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 10404 bytes
font_02_sfnt_off0000d48b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD48B 4324 bytes

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