Malicious PDF — malware analysis report

Static analysis result for SHA-256 0217c254c7fb8a5e…

MALICIOUS

PDF

75.6 KB Created: 2020-08-11 00:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60f32b0c5b43935c57c94973a0191a81 SHA-1: 06868b608ef29fa9fedc564f6f9e908ad7c01285 SHA-256: 0217c254c7fb8a5e1d59180592f0a77f1b5f1c9da615c256c0df3b035a0ef608
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many of which point to a link farm designed to obscure malicious redirectors. The primary malicious URL identified is https://ttraff.com/pify?keyword=assessment+for+learning+b.+ed+notes+in+english+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise its true purpose as an academic resource. The ML classifier strongly supports the malicious verdict.

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=assessment+for+learning+b.+ed+notes+in+english+pdf
    • http://files.biomems-supply.com/uploads/1/3/1/4/131483488/4855115.pdf
    • http://files.trentriverdesigns.com/uploads/1/3/1/0/131070689/e69d715a228916.pdf
    • http://files.secondhand-scalextric-shop.com/uploads/1/3/2/6/132682892/kipogotoruwunubinem.pdf
    • http://files.mstravelexec.com/uploads/1/3/1/4/131452922/vozapobolutevas.pdf
    • http://files.heartlandirishdancers.com/uploads/1/3/0/7/130775221/68b641962803544.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/dasevisifesokojix.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/62108175765.pdf
    • https://cdn.shopify.com/s/files/1/0434/9103/3250/files/somepeg.pdf
    • https://cdn.shopify.com/s/files/1/0440/3567/0166/files/popifapobubo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/crop_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/82476179273.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/bapetutaxifufov.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/creative_bio_examples.pdf
    • https://cdn.shopify.com/s/files/1/0437/6241/7825/files/58752702675.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/jevenugurupogobotinapimu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/87621596329.pdf
    • https://cdn.shopify.com/s/files/1/0431/3468/1250/files/zuxemujoperuvonawux.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e910.bin
754ec48ca0a4372c54b76f9780ba501518c7e2ec718f0a77295c021290111aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 5616 bytes
font_01_sfnt_off0000fbf9.bin
f1a6971cf0996a9220f4a2193cb90713a0b8412c8eb97ad5139a8130512e9190		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 11092 bytes

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