Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d960e1b71f5c9bc…

MALICIOUS

PDF

45.1 KB Created: 2020-08-01 16:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 821ba6303a18a2acfd2879cdd253a259 SHA-1: b91b9fa433907107dd800e9f7b6c44aa9a8153c4 SHA-256: 6d960e1b71f5c9bc9778f516f78a59cb0b0c75f0de8e60e9eb4865a31c06db43
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the primary malicious URL, suggesting an attempt to lure users to a compromised 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=big+oak+tree
    • http://files.melindayoungmd.com/uploads/1/3/1/8/131858287/posimezusava.pdf
    • http://files.mitchellhabitat.org/uploads/1/3/1/3/131384359/gifas.pdf
    • http://files.kca-agtb.com/uploads/1/3/0/8/130813755/c00fdb07.pdf
    • http://files.rbjewellery.co.uk/uploads/1/3/1/3/131383942/pexuzozuwuxofi_vexen_dojopariki.pdf
    • http://files.northernlightsplastics.com/uploads/1/3/1/8/131856539/xenofavelifodidad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/22639744715.pdf
    • https://cdn.shopify.com/s/files/1/0434/9041/0658/files/66276322798.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/84971284812.pdf
    • https://cdn.shopify.com/s/files/1/0435/5319/4133/files/64993758835.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/sekadonuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1641/1547/files/pagalezeko.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/kakuzakovejif.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/morejafi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/41120767464.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/79300776242.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7847/files/liniromujivejuwarunavur.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/subaxivixutirawukozixanax.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_off0000729e.bin
dad86043ce1b2b9a4b8b8691f557b29f956f6bd7e4961d689f19cc40258a1e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729E 4756 bytes
font_01_sfnt_off000082e6.bin
595597f21066d9ef3464259145067373e8744efe52b4060eb5a546754209c6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E6 10744 bytes

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