Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0729474976abf9…

MALICIOUS

PDF

47.6 KB Created: 2020-08-06 03:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c72106a1ae02ac05ee581799df72fa01 SHA-1: c2eb56ec47756d71e0964ae5a18a6eb5d664a816 SHA-256: bd0729474976abf97abe4a444acea08c53927fbb4f2ad2375fc06b8373607dec
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 a search result for educational materials. It also features a link farm with numerous external PDF links, many hosted on Shopify, likely for SEO manipulation or to distribute further payloads. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL supports a phishing or redirection attack pattern.

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=calculus+early+transcendentals+6th+edition+pdf+solutions
    • http://dapuv.blendedscience.net/uploads/1/3/0/7/130776644/wudaru_vepexojuzod_sajamevukotal.pdf
    • http://vujowej.nazikgallery.com/uploads/1/3/1/4/131406082/7976c05c.pdf
    • http://files.canyonfallsestates.org/uploads/1/3/0/9/130969151/8af2e8931.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/wefoxaxunividogup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2321/files/pupiximam.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/wowaduvisugorumixisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/78222397701.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/88872978607.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/47354527307.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/articulaciones_del_craneo_y_cara.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/51493138187.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/worthy_of_my_praise_chords.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/differential_equations_4th_edition_blanchard.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/6737875250.pdf
    • https://cdn.shopify.com/s/files/1/0437/9030/3381/files/diplomasi_budaya_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/anemia_ferropenica_oms_2020.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_off0000646f.bin
3ed753955b23409394d45973618607d5d8033b0d287c3779ec219a6769e52c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646F 5404 bytes
font_01_sfnt_off000076cd.bin
77535f1fa74f58e42f002aace62f54ade9fe7d7010ee91d9d45ce521027d105f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CD 14140 bytes
font_02_sfnt_off0000a30a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA30A 4324 bytes

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