Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc73829af1b1ab0…

MALICIOUS

PDF

35.2 KB Created: 2020-08-30 16:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e548bc2b9b7ac39d3db5becf8c5e6e19 SHA-1: 5a9976669ca18c95296a29ef258b4eda7903cf50 SHA-256: dcc73829af1b1ab0fc706a44f5a5e645dd604ae77262d9c2fa2bb828e34293ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The embedded URL https://ttraff.cc/wix?keyword=dynamix+treadmill+kp329+user+manual is the primary indicator of this malicious redirection. The document body, though heavily obfuscated, contains text related to a treadmill manual and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious.

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=dynamix+treadmill+kp329+user+manual
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/11112442000.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8686/files/36644622982.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/15405654004.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/82329590888.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/itil_foundation_exam_study_guide_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/8904/9238/files/number_format_php_w3schools.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/38613696982.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/agrarian_revolution_in_britain.pdf
    • https://cdn.shopify.com/s/files/1/0462/4380/7392/files/87514371684.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/36080308584.pdf
    • https://cdn.shopify.com/s/files/1/0433/1094/0328/files/77756356550.pdf
    • https://cdn.shopify.com/s/files/1/0434/4945/0661/files/99072425316.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_off00004aa8.bin
03b3c2ea413e109cfbfb8f46730a4e2d6ad71debf39668db4763cacce9e97773
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA8 5788 bytes
font_01_sfnt_off00005e4c.bin
7e0691702765e4589bd52f1f5c4526834109e6011320e6de298b9e0941453afc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4C 9964 bytes