Malicious PDF — malware analysis report

Static analysis result for SHA-256 9297e4d18c75dc26…

MALICIOUS

PDF

54.6 KB Created: 2020-07-26 11:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12d307eeecd4939f3777d9aa0a4c9238 SHA-1: 5d76a8f195122a1db059fa89787e83668380d37b SHA-256: 9297e4d18c75dc264d5b4948d3c7d85627e4ac10a43229ba6aee7eff05b6d812
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. One of these URLs, https://ttraff.ru/pify?keyword=best+paid+android+games+free, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a malicious redirector suggests an attempt to lure users to malicious content or phishing sites.

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=best+paid+android+games+free
    • http://files.en.guacamaya.info/uploads/1/3/2/7/132740281/736524.pdf
    • http://files.teamanton.net/uploads/1/3/2/6/132696506/kokilozixovewivaluri.pdf
    • http://files.budreau.ca/uploads/1/3/1/8/131857527/lesojiforopavipo.pdf
    • http://files.en.guacamaya.info/uploads/1/3/2/
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/89575821217.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/52124624252.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4495/files/87694435901.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/miwabefufaxidifesezata.pdf
    • https://cdn.shopify.com/s/files/1/0428/1224/4134/files/vesukus.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/49898025869.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0433/7827/8550/files/xezegasixedaguwejobufa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/52553042522.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/85085796267.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/82694573776.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_off00009922.bin
983bbf2ba2b2133cd22aa22970d8188b44750baaf03357912c332f452d3e3ede
pdf-font-stream PDF embedded font (sfnt) at offset 0x9922 5168 bytes
font_01_sfnt_off0000aa96.bin
49dc5d0e8d18382b1cbba64cba888c6b9c1970561954a7cddfc18d53fa9e88fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA96 10260 bytes