Malicious PDF — malware analysis report

Static analysis result for SHA-256 9825636ebc4a81d9…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 18:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b907fe5b1c08e473a4824b71895d5e SHA-1: 7327f2a826dc7b28bb6c81d52218dbe5385d7b0a SHA-256: 9825636ebc4a81d92d2c7b1378eb3ed55442d616afaa42e90896e9e326997aab
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to a book title. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier 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.com/wix?keyword=thrawn+alliances+amazon
    • https://cdn.shopify.com/s/files/1/0430/0328/1571/files/roxuxigowawerapigigol.pdf
    • https://cdn.shopify.com/s/files/1/0465/4995/8814/files/26704133886.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4930/files/87728069370.pdf
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/vajikiparebev.pdf
    • https://static.usrfiles.com/ugd/47b1e8_2e2fc6e89e994075b60c22abd6b78449.pdf
    • https://static.usrfiles.com/ugd/3e5d97_98b164d1977f49f386bc81318de30251.pdf
    • https://static.usrfiles.com/ugd/b8c837_38708ea07c0845c2a202dda7ae14a2e3.pdf
    • https://static.usrfiles.com/ugd/83b1b3_8c775538784641a5902cad29dc805ff2.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/weritajemoxipogidabofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5458/0391/files/ligezedoliraduri.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/tadonefaxubukagutamo.pdf
    • https://static.usrfiles.com/ugd/19103d_67f195e8e12448c4a74b98a269902c0f.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_b12e95eaf6a94ae6ac9869495ad3f42e.pdf
    • https://static.usrfiles.com/ugd/affb4a_5d345c7e22484b44bf9de642171cecb4.pdf
    • https://static.usrfiles.com/ugd/d3758e_b315cb2810bf473a8ee7a41c5cadd6b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5dfcd64b124a93b4e0901c533032a3.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_off00006784.bin
6c0c229f16b554c828709ea3a4d4a400f379621106cde6bbe502eab144b4b7a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6784 5128 bytes
font_01_sfnt_off000078dc.bin
1e2393dfa34e9b4c7ef53c0cab78f72cd7cb0d89d17609ab7c2b36ef38f61658
pdf-font-stream PDF embedded font (sfnt) at offset 0x78DC 10080 bytes