Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93d583159ec4c3b…

MALICIOUS

PDF

51.1 KB Created: 2020-08-30 02:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3442dd30a1cab3288ca42f9635d38473 SHA-1: 61e4d0b594c81f5a1d660164944d248242f4f88c SHA-256: d93d583159ec4c3b0aaf8c9476db61cfc667069dc410fe0057e5536f1e74b7a2
152 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.ru, which is presented as a weighted blanket guide. This indicates a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to obscure the malicious destination. No scripts were extracted, but the primary malicious activity is the redirection to the harmful URL.

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.ru/wix?keyword=weighted+blanket+guide
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/97396647053.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9807/files/12858108442.pdf
    • https://cdn.shopify.com/s/files/1/0447/4172/2263/files/47150127835.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4885/files/behavior_approach_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/tadosakiwometabu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5079/3122/files/botany_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/bidodutanin.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_91c8c7a706c54d5e9b632625c3c11752.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b8b240113f84047861855218c3ba26b.pdf
    • https://static.usrfiles.com/ugd/b8c837_666dccc875de4a9b890f7e5c2c0f4a59.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_a84da98a239249f59a0af060da295925.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/python_round_to_2_decimal_places.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/pategujepuwubolaguk.pdf
    • https://cdn.shopify.com/s/files/1/0432/9318/0070/files/buxarulojak.pdf
    • https://cdn.shopify.com/s/files/1/0436/2862/6080/files/14204490621.pdf
    • https://cdn.shopify.com/s/files/1/0435/5765/0584/files/js_string_contains.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_off00008148.bin
8ced69aa185a05f6455dad7c5b2927e3275f3a01dff8a4591c9f0bee0a732811
pdf-font-stream PDF embedded font (sfnt) at offset 0x8148 5028 bytes
font_01_sfnt_off00009269.bin
a1362ab846d81c720473501cb04312dc862f8c4a039eef2118d0c41f2df87d2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9269 14172 bytes