Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af4a055af4fe066…

MALICIOUS

PDF

40.7 KB Created: 2020-08-14 05:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98885846a3a5dc3c0ab2bf849e711857 SHA-1: b9c7276256e91e7c13b30068c6ced57543d1d9ad SHA-256: 6af4a055af4fe066dce722c3a2c9b3966035f1aeeed05bf4d56a4552655a0a64
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also features a large number of external PDF links, suggesting a link farm or distribution mechanism. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

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/wb?keyword=d&d%203.5%20rogue%20handbook%20pdf
    • http://files.luna-solyoga.com/uploads/1/3/0/7/130740017/73d750.pdf
    • http://files.jenniferschweitzer.com/uploads/1/3/2/3/132302928/kosesi.pdf
    • http://files.frederickjbrittain.com/uploads/1/3/1/4/131482881/19e772.pdf
    • http://files.thaispawellnesscenter.com/uploads/1/3/1/4/131406744/1692606.pdf
    • http://files.emilyrobynclark.com/uploads/1/3/0/9/130969762/18a4d2005e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/famifumifogoba.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/injection_bijection_surjection.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/51466537353.pdf
    • https://cdn.shopify.com/s/files/1/0437/0314/0517/files/cleaning_services_company_profile_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/60535627107.pdf
    • https://cdn.shopify.com/s/files/1/0440/2960/8101/files/nunofojafagapefibubik.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/30911692712.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/formation_excel_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4885/files/8191416110.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/99873705644.pdf
    • https://cdn.shopify.com/s/files/1/0435/4696/8218/files/tekefuxoxixopozemowines.pdf
    • https://cdn.shopify.com/s/files/1/0429/7572/3673/files/read_textfile_java.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_off0000620e.bin
aee99b222cd6436686fc1950c70eddb31f3190a8e42336a2f9d4910ea93cda3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620E 4156 bytes
font_01_sfnt_off00007039.bin
29f1b7f98f7b70ef65b6f70629a627e3bc70940663f307f1cffe9004971a6f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7039 11816 bytes

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