Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d7f2255f77b64c…

MALICIOUS

PDF

50.1 KB Created: 2020-08-07 17:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7abdf0900a080c6ab64e19853258972c SHA-1: 22b430cb0718c16591e3fbd15f00a57afbd11a4f SHA-256: 63d7f2255f77b64ca70e6ad649833886c34cd2e261c555bdcf6bdeeeccf5662b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a student tardiness questionnaire. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, many hosted on Shopify. While no scripts were explicitly extracted, the PDF structure and the presence of malicious links strongly suggest an intent to redirect the user to a malicious site, likely for phishing or further malware delivery.

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/pify?keyword=student+tardiness+questionnaire+pdf
    • http://files.ithacahoneyworks.com/uploads/1/3/1/3/131383649/2509888.pdf
    • http://molawem.albanyareacatholiccommunity.org/uploads/1/3/1/4/131453416/relomajezebaxonodu.pdf
    • http://files.franklalumia.com/uploads/1/3/1/4/131406082/3496536.pdf
    • http://files.soyouknow.info/uploads/1/3/1/3/131380440/bigozig.pdf
    • http://wokubi.martynsmondayclub.co.uk/uploads/1/3/1/0/131070450/dizovutotitukonadan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2402/1664/files/caudillismo_en_latinoamerica.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/binocular_vision_anomalies.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/juwebexapemawete.pdf
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/30913518206.pdf
    • https://cdn.shopify.com/s/files/1/0441/1988/3928/files/40337669151.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/understanding_telecommunications_business.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/75106719471.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/21771857839.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/48547618271.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/62686473050.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/ordo_hemiptera.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086d0.bin
5212cd7db2f68cab7f6691f15ca9251e4b7349991ba175cfef9d4c20a8639b9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D0 5232 bytes
font_01_sfnt_off000098a7.bin
35f416ec1d7f1884a80b21a538505b46a408ca3d476d268e67f74cd57d781790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A7 10088 bytes

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