Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b425da8af0f4dc…

MALICIOUS

PDF

49.3 KB Created: 2020-08-30 10:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cad5386c77dcfc8dfeeab95141401a8 SHA-1: 90c9cb0795214c038442e63583492062a48c1f6b SHA-256: c0b425da8af0f4dcca603c24e05a7703005fa7734344d9a81cfd62195c16fb53
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 torrent download for a Jay-Z album. The link 'https://ttraff.cc/wix?keyword=jayz+album+torrent' leads to known malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO manipulation or to host further malicious content. No scripts were extracted, but the primary attack vector is the malicious link.

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/wix?keyword=jayz+album+torrent
    • https://static.usrfiles.com/ugd/97634b_baa0541ea57048a8ab6f82ba92709d5b.pdf
    • https://static.usrfiles.com/ugd/79cb75_f0caa4fd66a54aa79418fd7cad3b1ec0.pdf
    • https://static.usrfiles.com/ugd/d775a9_3bdee46f159a4c4883bedff57b3c91b0.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/toxukoxolesapor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/3956598208.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/32815936297.pdf
    • https://cdn.shopify.com/s/files/1/0432/6123/1262/files/77506618292.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7794/files/stock_inventory_control_spreadsheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_260a36ff4bd146d7914a3785e69143f1.pdf
    • https://static.usrfiles.com/ugd/df4650_14fdfb27540445d0be95e3fb8865b48b.pdf
    • https://static.usrfiles.com/ugd/8b2c09_526c8dfdbc9147628d5ea9f3ef390ecc.pdf
    • https://cdn.shopify.com/s/files/1/0428/8767/6063/files/zafolesalinatomejon.pdf
    • https://cdn.shopify.com/s/files/1/0439/9595/5358/files/14160049127.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1791/files/aligning_with_the_divine.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/acgih_industrial_ventilation.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_off0000735e.bin
42373b54c1ee860e1b3ed2cbfd8147923a9b14b08ed0f610a750f6db82dbeac1
pdf-font-stream PDF embedded font (sfnt) at offset 0x735E 4932 bytes
font_01_sfnt_off0000841d.bin
352701cd915809c5529ae11407a149c8fe9773cb564062e5203f20bf87d8788a
pdf-font-stream PDF embedded font (sfnt) at offset 0x841D 17480 bytes