Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f1c963d358c8e6…

MALICIOUS

PDF

43.2 KB Created: 2020-08-30 19:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e63f2c7a14edea35a49cbc24f744ee1a SHA-1: a31d0b145c9092d842cf75522e67ab0717efb3f3 SHA-256: 65f1c963d358c8e62f1ffe414165eb8d5d66b387bde52494119bb50e2c44c083
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests an attempt to obscure the final malicious destination and potentially trick users into clicking through to a harmful site. The ML classifier also strongly indicated 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.link/wix?keyword=behavior+contract+for+teenager
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6481/8838/files/isometrico_e_isotonico.pdf
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/calibration_procedures.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7814/files/modern_brazilian_portuguese_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0972/7912/files/37822275915.pdf
    • https://static.usrfiles.com/ugd/b8c837_89ad23fa5c5d4c0ca8e745aeb109c8d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6e58425420a424886fa6e7d8e2336de.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1a25227efe24efa84f4228e272ced14.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7a1767b0ebf4c67a7d7807bdf1b2781.pdf
    • https://static.usrfiles.com/ugd/b8c837_574a037abe994a8a9fa4f279587cdbb0.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/naomi_klein_shock_doctrine.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9563/files/cita_previa_cap_el_vendrell.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44368867506.pdf
    • https://static.usrfiles.com/ugd/daca0d_378074c5b3b04289bafeb8aba895ad98.pdf
    • https://static.usrfiles.com/ugd/b13fd1_fe85500f494b47818c0d98013cdaa155.pdf
    • https://static.usrfiles.com/ugd/97368a_41b16328d4f346e1a0c99f836898031f.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac6.bin
94244baf3615be734ce723eb3b66f28a2e58df400bee12333a9cc9d602762e55
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC6 5040 bytes
font_01_sfnt_off00007bf4.bin
ab8fba5143871e5f098152d52b47254e73fc6520b00a21757989ef7e2331a79f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF4 10460 bytes