Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f7385790b5616c…

MALICIOUS

PDF

57.9 KB Created: 2020-09-20 00:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eaddfa7b2c725e67ff8de9c9a18f25a SHA-1: 35881a7030e8fdf80df1ea8b0fec840806aa156e SHA-256: 24f7385790b5616c94ffd1d641ee74b07c3456252165dca11f70474e2e6ee4be
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link to 'ttraff.me', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to a security guard exam study guide and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links, many pointing to files hosted on filesusr.com, indicates a link farm strategy to obscure the primary malicious destination. The ML classifier also 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.me/wix?keyword=temario+vigilante+de+seguridad+2020+pdf+gratis
    • http://files.hammeriefarm.com/uploads/1/3/2/6/132696465/kuxiloboram-fesunosite-loxigojidimuz.pdf
    • http://files.godshealingprocess.com/uploads/1/3/1/3/131383548/2258471.pdf
    • http://parawemo.dylansunkel.com/uploads/1/3/1/4/131483214/9170660.pdf
    • http://files.ksyme.org/uploads/1/3/1/6/131606733/nisusobetirebixo.pdf
    • http://files.afterthefallinc.com/uploads/1/3/0/8/130874213/burifikivaberu.pdf
    • https://e5929608-3c79-4df8-9d52-7d682038d9f9.filesusr.com/ugd/cb2bed_70333b0ee23c4d9786e318baf89da364.pdf?index=true
    • https://8a2aceef-3d5e-4144-bddd-efa51143f5a7.filesusr.com/ugd/07e02c_632fb82e79cf4888bde6c00f4aecb412.pdf?index=true
    • https://c751acd3-3f69-491e-bed0-dd2f681beece.filesusr.com/ugd/b91392_09d649dacf324a529787cdec34b85020.pdf?index=true
    • https://ba5f68ee-b5ec-456b-b2e6-d50227bb8d69.filesusr.com/ugd/3fd21f_781194d85f92490f811d8e1f52d8f183.pdf?index=true
    • https://0cd7cc6f-edf5-4afb-ad5d-6d2d5c105ab0.filesusr.com/ugd/1cc7e8_bf0e33ba4f4e4db8a02a861c63fc0bda.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/rogitop.pdf
    • https://b6aee17b-61f1-455d-b269-7bcf3b5d1e68.filesusr.com/ugd/9f06f8_62433dd5f33d44c4b78bc88e6ee65ec1.pdf?index=true
    • https://22ef208a-4944-48c0-9124-19dd0af58a51.filesusr.com/ugd/33a16d_98d3de51ec4c43a2a4d3a80468087b67.pdf?index=true
    • https://79ec31c3-702c-4927-ac36-5d3bdfdcbe6d.filesusr.com/ugd/ce4b7c_501c21a11d6c43d28046440de826013d.pdf?index=true
    • 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_off0000a071.bin
46142d9a99ac2e8a324a770514fc3e2b2ac37cc85db5605b8f94aa23c4f17ba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA071 5644 bytes
font_01_sfnt_off0000b394.bin
63347bd8b63b9c1466b8c7c284c0ec0e948d5cdcf275db180a7a0725bc5a711c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB394 11696 bytes

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