Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b6c0e669bb0af2…

MALICIOUS

PDF

47.3 KB Created: 2020-08-18 17:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3e025565f1f2e17c5ea23ed9810942f SHA-1: 740f663e29da1c28d23afe0f0f044ea7b81097bd SHA-256: 90b6c0e669bb0af25f18b7bbdc95d962616c0e627f5170fca6ff19c98d736b85
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=2019+all+movie++bestwap'. Another heuristic indicates a PDF link farm, with many links pointing to Shopify-hosted PDFs. The document body contains garbled text but includes the aforementioned redirector URL and several Shopify URLs. No scripts were extracted from this sample.

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=2019+all+movie++bestwap
    • http://files.professorwillis.com/uploads/1/3/0/9/130969819/3536095.pdf
    • http://files.dcchurchofchrist.org/uploads/1/3/2/6/132682134/gekikazu-japatosi-bajid.pdf
    • http://files.makefunoflife.net/uploads/1/3/0/7/130776632/00e14.pdf
    • http://files.puddletownknittersguild.com/uploads/1/3/1/4/131453615/3487187.pdf
    • http://files.futurescapes21c.com/uploads/1/3/2/6/132682868/jijodox.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/vokixozujew.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/loxodebop.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/the_anthropic_cosmological_principle.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/chhattisgarhi_gana_karne_ke_liye.pdf
    • https://cdn.shopify.com/s/files/1/0435/8645/3663/files/ios_13._3._1_ipsw.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/95652279834.pdf
    • https://cdn.shopify.com/s/files/1/0437/7028/2142/files/torovefelaxepuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/nusaweramasosugobomijid.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/vmware_workstation_15_pro.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/4224220529.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006469.bin
4b2a9d5bb965672892a2ebf8f09665acf653555cb80505ac39a2faed3559e3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6469 5548 bytes
font_01_sfnt_off00007741.bin
e477ed437aee14acf1c108a8f91ae8d96c67da5029a4bf2406f8c760fde2d0cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7741 10060 bytes
font_02_sfnt_off000099dc.bin
1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99DC 16544 bytes

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