Malicious PDF — malware analysis report

Static analysis result for SHA-256 81006c2b5a46c61e…

MALICIOUS

PDF

37.9 KB Created: 2020-09-19 18:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdc57987022ebfeb1c28f05d59ef9a6f SHA-1: 234e9c198843494e1f117d893501919f491f0697 SHA-256: 81006c2b5a46c61e42e68cdfd51aa66fe0dd2d485593dc100fce323a4b371aee
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector URL, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. The primary malicious indicator is the redirector URL, which likely leads to a malicious payload or phishing page.

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.link/wix?keyword=merry+tiller+scotsman+manual
    • https://cd02f6a8-b2ae-4b34-8b4f-df49ed704b04.filesusr.com/ugd/93c935_c564a5e09f6b4f3b890d7a1987139156.pdf?index=true
    • https://04991caf-c201-4cfb-a5c5-21cb7ecd60a5.filesusr.com/ugd/b91566_673ef45b386743b2a2c697474a799470.pdf?index=true
    • https://ec718488-5532-427c-88e4-4df7bacb90bb.filesusr.com/ugd/22739b_8466bb710d364823a8e33a650b0397f6.pdf?index=true
    • https://efdac8d4-fcdd-41b7-b0be-86eb0b26aabf.filesusr.com/ugd/b56239_b2981dd434b2452ca85518ebde6c874b.pdf?index=true
    • https://0824c5ae-7202-41a3-b45e-878272ee46cc.filesusr.com/ugd/9df9d6_9d96cd66b1014858825a812560e0354f.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/mckinsey_problem_solving_test_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/boris_johnson_eu_brexit_deal.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3795/files/93115392006.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/51353052204.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/28362191247.pdf
    • https://de8a1f30-3f6d-4b4d-86fe-35bcb431cab9.filesusr.com/ugd/7c1f05_6440f138c736480b9f72bb083c6085c5.pdf?index=true
    • https://2fb25829-4972-4849-a952-6eb667df3e25.filesusr.com/ugd/98857b_701c4cee5b6940d0b6f04a9494804b42.pdf?index=true
    • https://3161dafd-f7e6-437c-a3f2-d6df8533b68c.filesusr.com/ugd/93c935_abe14a92405d495c9a8a1d99d868b63b.pdf?index=true
    • 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_off00005628.bin
5ad983ba64ce975da3aeac6ae0d5809cb491e18923e3917ddcc65db46c214a15
pdf-font-stream PDF embedded font (sfnt) at offset 0x5628 5052 bytes
font_01_sfnt_off0000674f.bin
56581d12d16bbd5fba369d9af7c7bd3f01345fb0cd852b650e6307dbcf924bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x674F 10452 bytes