Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6be5a3e991530c…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 05:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec9e8fb25cf29c20140aafc19a1f98d4 SHA-1: 8039d0b4c8f97fd1f8a9c6520b6a3c168168f8b2 SHA-256: 4f6be5a3e991530cb7ec63df60c6af236338ed9d9eecefb653409ee54c912253
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.ru, disguised with a search query related to anthropology. This suggests a phishing or social engineering attack aiming to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent. No scripts were extracted, but the primary attack vector appears to be the malicious URL embedded within the document.

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=what+is+a+deductive+approach+in+anthropology
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/95315454715.pdf
    • https://cdn.shopify.com/s/files/1/0440/6208/1174/files/fix_app_not_installed_problem_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/xojeforebadetilupu.pdf
    • https://cdn.shopify.com/s/files/1/0459/9808/0157/files/89330746267.pdf
    • https://cdn.shopify.com/s/files/1/0432/7450/2312/files/56932041145.pdf
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/satoxuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0455/files/68605491815.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/pocket_oxford_chinese_dictionary.pdf
    • https://static.usrfiles.com/ugd/eda9ba_09deefe3f7104deda7a4b14217fd6a3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f24b2a8162de48dea51353511b9fd9f4.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_off0000649b.bin
bee4a042c1b5835bb92b5948e0f00f0e756f2881b419b5448fad4343297fd74c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649B 5508 bytes
font_01_sfnt_off00007764.bin
87e482a4685258a4e12dfb31c18d3e82b0d5164c4f3fb49c0a9f015242763ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7764 9908 bytes

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