Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a760332735fa59c…

MALICIOUS

PDF

40.0 KB Created: 2020-08-22 04:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8abd8751727ca07ec2b8acaa0a3d6a5 SHA-1: af80f5fcd961073bc4c6e54d79786e5287e395e7 SHA-256: 6a760332735fa59ca5d4540496053b498390726f0abddf20bd3f30d02936122a
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to software, suggesting a lure for users seeking downloads. The presence of numerous PDF links, many pointing to Shopify, further supports the idea of a link farm or content stuffing to obscure malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=sap+crystal+reports+runtime+13.+0.+21
    • http://getosa.wekeepyoumotivated.com/uploads/1/3/0/7/130739287/6037708.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2779/8944/files/77849530349.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/list_of_3d_shapes_and_their_properties.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/whatsapp_plus_6._76.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/74209459146.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7206/files/89472410386.pdf
    • https://cdn.shopify.com/s/files/1/0434/5066/3062/files/58366458250.pdf
    • https://cdn.shopify.com/s/files/1/0440/9108/0869/files/10963448630.pdf
    • https://cdn.shopify.com/s/files/1/0437/4629/5959/files/90210001723.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/fowuvareruruxiredegotum.pdf
    • https://cdn.shopify.com/s/files/1/0435/6086/1845/files/fomakowakafabubotenoweles.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/biblical_commentary.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_off00005cba.bin
980f857d119d1ab83aa9a530bfdd767bb488de6db69e18613b108a7468570312
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBA 5804 bytes
font_01_sfnt_off0000706e.bin
9e1b381e1f0215160a4ece85bd9370f7a78dbe7f7aae4638bb699b82daf70ab1
pdf-font-stream PDF embedded font (sfnt) at offset 0x706E 10500 bytes