Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dac4df72a49acc1…

MALICIOUS

PDF

37.3 KB Created: 2020-09-01 02:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c44eec57942a97a843edff6f921c8c9c SHA-1: 8a620871ff57944248400cd28f3eb356d6e94633 SHA-256: 0dac4df72a49acc1dad8713697b6f62c2beaed1df3a2b7e5f38f224953b0dbbc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, with one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a lure related to sheet music. The presence of numerous external PDF links, many pointing to user-generated content sites, indicates a link farm strategy to obscure the malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.com/wix?keyword=hallelujah+jeff+buckley+sheet+music+piano
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/d1c05f_bd16fddad81d46048fc7dedb68f45c66.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc105667636b409cac439df943fa0c99.pdf
    • https://static.usrfiles.com/ugd/0f5b72_361932654f074148853ca0b7cc3c7501.pdf
    • https://static.usrfiles.com/ugd/913720_cf11250b74b848d1bd6db9d3ad682013.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/zozopagukafov.pdf
    • https://cdn.shopify.com/s/files/1/0460/3625/4879/files/sifulapuwunijugexupuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/95064442697.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/41325166443.pdf
    • https://cdn.shopify.com/s/files/1/0435/3110/8504/files/21778126728.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/34681312211.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/1985_nba_finals.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2827/files/commandos_strike_force_trainer_free.pdf
    • https://static.usrfiles.com/ugd/cafc24_136a05a70c7942db9b2ad10e04bff249.pdf
    • https://static.usrfiles.com/ugd/430cb2_58007590d3414f80a49b0afa27b6523a.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_29d0988f4ed24260a16f4b24e657ed00.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004610.bin
dce6eea1a4434fed7096bb2f6f0aa2d29527bb432492420f1cb7119149b5c0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4610 5384 bytes
font_01_sfnt_off00005844.bin
6782d3f9397a76eda0b042c78f217127731d6d4a001f8e5b410684a819df6b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5844 9780 bytes
font_02_sfnt_off000079e4.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E4 4324 bytes

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