Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4b7b7d276aa899…

MALICIOUS

PDF

43.4 KB Created: 2020-07-31 20:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315e7f95cd178ebebaa8008577964292 SHA-1: 5ef4d3180b6855c02249553c2dcd2ac06c759d84 SHA-256: 1c4b7b7d276aa899bef4695c612f3177ae83cd3a1710b0a17f71edc359f6a39c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=my+dog+skip+cast', which is also flagged as a malicious redirector. Additionally, a large number of links point to PDF files hosted on cdn.shopify.com, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=my+dog+skip+cast
    • http://files.sarahbonnot.com/uploads/1/3/0/7/130738852/2ce08.pdf
    • http://files.leighbivens.com/uploads/1/3/1/8/131872079/xolunesiziferezazutu.pdf
    • http://files.divaandmeproductionsinc.org/uploads/1/3/0/7/130739719/8678a1a5.pdf
    • http://files.humanist-sociology.org/uploads/1/3/0/8/130874121/zonuno.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6790/files/rokaxavamadale.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/zepujuxaroriwudetevirot.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/pusibotemijibekimobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4135/6950/files/6453360437.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8333/files/26793863439.pdf
    • https://cdn.shopify.com/s/files/1/0431/0545/2193/files/65295418405.pdf
    • https://cdn.shopify.com/s/files/1/0431/9477/7757/files/tumuwizat.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/99497450961.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/47546038325.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/16864330374.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/30053170614.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/74212439699.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/pusirokagavekofizubowa.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/
    • https://cdn.shopify.com/s/files/1/0431/9477/7757/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a2d.bin
a7d08043f047943c4f45cdbfb11e554a000f512089bf553d29e6eb3588eb2f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2D 5284 bytes
font_01_sfnt_off00007c5a.bin
e5abedc199d714e962757b24a0ebb6495fd7d17af534ca21ff0afed77ab08cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5A 10624 bytes

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