Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0a04e1e9832040…

MALICIOUS

PDF

41.7 KB Created: 2020-08-27 16:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac32beb95eb94bda339b510886a6eb2f SHA-1: 7a55b7851927f2dd868e4d8d3fc5c9814185df79 SHA-256: bf0a04e1e9832040f4ffda398d4271e83f1b0ebb0929d3435f8ff2c9b2e18028
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body text, though garbled, suggests a lure related to an audiobook, aligning with the malicious redirector's URL. The presence of a link farm and the ML classifier's high confidence score further support the malicious classification. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=pimpology+the+48+laws+of+the+game+audiobook
    • http://files.thatweddingninja.com/uploads/1/3/1/8/131857402/5948748.pdf
    • http://files.joymcdanieldance.net/uploads/1/3/1/3/131379443/kitajanaz.pdf
    • http://files.nortmilkendigital.com/uploads/1/3/1/3/131381369/9625977.pdf
    • http://files.customdartshirts.com/uploads/1/3/2/7/132740586/7683795.pdf
    • http://dirop.nellanis.com/uploads/1/3/0/8/130813108/11141b0a.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/65619743930.pdf
    • https://cdn.shopify.com/s/files/1/0438/6314/6656/files/popamive.pdf
    • https://cdn.shopify.com/s/files/1/0437/8601/0776/files/numerical_methods_for_engineers_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wuvinotagug.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6000/files/philips_avent_manual_breast_pump_parts.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/dokuzumezobafamana.pdf
    • https://cdn.shopify.com/s/files/1/0437/7962/1026/files/gofozixirajilanu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/wobisekulowiribini.pdf
    • https://cdn.shopify.com/s/files/1/0437/3898/8709/files/9117462867.pdf
    • https://cdn.shopify.com/s/files/1/0466/3027/3189/files/tozasetalizidozisafugawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/xerostomia_definicion.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006195.bin
9a7590a56158afa96e2a40b2760dab21d9b32aef4cb364e8b3f388355784a145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6195 6040 bytes
font_01_sfnt_off0000761c.bin
fd63f0dc0399e68a4939e6f17a93b46a5ef4bd51a6e8a363f947862b5459a29c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761C 10448 bytes

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