Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f639f726d03bdf9…

MALICIOUS

PDF

43.4 KB Created: 2020-08-30 14:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bde54fd57478e60e9b143adf4452e80 SHA-1: d9db06c7aab06017055a918db199f03f6180da27 SHA-256: 0f639f726d03bdf986169dbd817ad9557fd2f215a5d5254ebb96eb6fa0a2c84e
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure for a driver download. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to host a link farm for malicious purposes.

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=nvs+3100m+driver
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b20c93d4ea154df0a77c5ec43467059e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7c462d476e04256a53a9cc320975875.pdf
    • https://static.usrfiles.com/ugd/b8c837_0575b038a9734f3d914b65e489cd4a48.pdf
    • https://static.usrfiles.com/ugd/3649d2_26496454a15346aab75499a6fe6f2662.pdf
    • https://static.usrfiles.com/ugd/4b7290_531dc042417c4ebb8284682bf5cf7f72.pdf
    • https://static.usrfiles.com/ugd/856cea_d73b1dff514b485cb9705f0b8396ed49.pdf
    • https://static.usrfiles.com/ugd/9c43ec_b029cf873850492b9d6f3dd7bfd4c51d.pdf
    • https://static.usrfiles.com/ugd/b8c837_95bde3f0ece449be9e72462082bb8498.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7859/files/wuzamotiroboga.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7208/files/45278745543.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/54465888381.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe522e3589b548c8a71564471d40eba4.pdf
    • https://static.usrfiles.com/ugd/11f207_c5e8e19736cd4c8c9f2acb17841763a3.pdf
    • https://static.usrfiles.com/ugd/f09a9d_3ea361daadaf4ef48396d7c396e50cb3.pdf
    • https://static.usrfiles.com/ugd/227d0f_d5c116b5fd70401ab5534e9d3ef67955.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_off00006068.bin
a48310e1b6e30af4df0d08b955d88f3fcd0cafea0276a4daf333df1c7d199dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 5116 bytes
font_01_sfnt_off000071ca.bin
9a96a84771f7b41b83741f6dbb4f1b00bb1d32d9daa8e33a2d6529321d39b7f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x71CA 14580 bytes