Malicious PDF — malware analysis report

Static analysis result for SHA-256 aceb7cbbf397588f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 16:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fa35457b4604c7fe804ef54c7802942 SHA-1: 67f808202214d31c804810534c4b7fa90dd92487 SHA-256: aceb7cbbf397588f7a9fd21fd546a19277b200a7143a21f53bd7f5c975f6ddd6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure, suggesting the document is designed to lure users to a harmful destination. The presence of a large number of external PDF links further supports this, indicating a potential link farm or obfuscation technique.

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=ragnarok+online+hunter+falcon+build
    • https://cdn.shopify.com/s/files/1/0431/7079/1573/files/4194776173.pdf
    • https://cdn.shopify.com/s/files/1/0441/0481/0648/files/38551260920.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/wokujevemujoxogofaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8089/3084/files/aloisia_horse_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/dizumopumovunoxe.pdf
    • https://static.usrfiles.com/ugd/b8c837_64a5360b754243ffa1bec505528476f8.pdf
    • https://static.usrfiles.com/ugd/6cfc61_cf18d61dc3e74f72a462e00672f0dcaa.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc4811e10edb45acbd096aa9428404c1.pdf
    • https://static.usrfiles.com/ugd/5ecadc_5ae1ae472d484f309f6c5a440332785f.pdf
    • https://static.usrfiles.com/ugd/5360f8_43ff0c715987405799fa7fef867294e2.pdf
    • https://cdn.shopify.com/s/files/1/0431/8593/0402/files/titokituv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2441/files/vexes.pdf
    • https://static.usrfiles.com/ugd/345929_34892b99905e4c09a769cd0bc2dd5f56.pdf
    • https://static.usrfiles.com/ugd/b8c837_45596a660d2d478ab33f6b427a3f0e8f.pdf
    • https://static.usrfiles.com/ugd/857e61_8b3403446911439885617b05f3a8c68b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e779b13cfdce488bb4cb7acf164f97d5.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_off0000697f.bin
7898b86bca791e2a903e4128e710237b01eb64f00a2c80012f47e09fb93497d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x697F 5316 bytes
font_01_sfnt_off00007b92.bin
0d2421bce2eeb8af23a1a6ada31dc02536afd4b2d9f2de8d59ea5d43bd159842
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B92 10152 bytes