Malicious PDF — malware analysis report

Static analysis result for SHA-256 140a2c9e4c4e9b71…

MALICIOUS

PDF

62.3 KB Created: 2020-07-30 22:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf56625967ba0b60c41efe7dee1dbb4 SHA-1: f07485d1d8d84ebb0a07cc4d65c0b7f2b4f5d33f SHA-256: 140a2c9e4c4e9b712114456651f297f4334d549270c3f8696307e76208ddc4ee
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure like 'ttraff.com'. The document body, though heavily obfuscated, appears to be a lure related to academic resources, suggesting a phishing or scam attempt. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards a link farm or redirection strategy.

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=binomial+distribution+questions+and+solutions+pdf
    • http://files.meladyluna.com/uploads/1/3/1/4/131406286/5867674.pdf
    • http://files.thesecretbrowclub.com/uploads/1/3/1/0/131071114/da838a.pdf
    • http://files.firstclasssuccess.com/uploads/1/3/0/8/130874055/07e619.pdf
    • http://files.juderoseaccountancy.com/uploads/1/3/1/0/131070841/vuvugedon.pdf
    • http://files.the-psi.org/uploads/1/3/0/8/130874477/b2849c65c76b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/25717715478.pdf
    • https://cdn.shopify.com/s/files/1/0431/0918/7750/files/juvetixodogije.pdf
    • https://cdn.shopify.com/s/files/1/0437/9086/0437/files/dipogepuxetobeseverib.pdf
    • https://cdn.shopify.com/s/files/1/0428/8043/4342/files/mirafipomupifavevej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42257023754.pdf
    • https://cdn.shopify.com/s/files/1/0431/4670/7104/files/8277750531.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2275/files/84926363400.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/52905364252.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/83866526848.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/gevetapelukabitafosutoruf.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/55549898715.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/45718279268.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/kegifawuwaxofenob.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_off0000a817.bin
f0c2e006afcc7f1e1eb638a03a254634ceabded286171d4c4f40ab40b64accd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA817 5384 bytes
font_01_sfnt_off0000ba33.bin
01adc6cb42cb9ba0d8f406b3fc6f76a59546ce6b1a2fc4b20ae8dc73a085da31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA33 15608 bytes

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