Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cda64195ebfee13…

MALICIOUS

PDF

59.1 KB Created: 2020-07-30 18:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0aa0a141a34d068ce5162546901a73d SHA-1: cb9d45cda79f7b63f1ef82f7c7f4574a5b1858e5 SHA-256: 3cda64195ebfee1390bcb0a25d615fbb2f4c51124d533e26615c3c103fec31a9
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=basetsana+kumalo+book+pdf+download`. This URL is part of a link farm designed to appear as a book download, but it redirects to malicious infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`, a tool often used to create malicious PDFs. 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.cc/pify?keyword=basetsana+kumalo+book+pdf+download
    • http://files.ibomusicalvoyage.com/uploads/1/3/2/7/132712235/ruxekazu.pdf
    • http://files.jessiebeefit.com/uploads/1/3/2/7/132740250/7295535.pdf
    • http://files.m.teakslockservice.com/uploads/1/3/1/0/131070895/jezovo.pdf
    • http://files.signmechanics.co.uk/uploads/1/3/0/8/130814252/doboxuwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/89342645595.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/wiwubexazaburakudedosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9586/files/52306941383.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/27364956545.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/34080094084.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/16196074893.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/3451289840.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/95423568318.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/dozakiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/9943/7721/files/kopozotatim.pdf
    • https://cdn.shopify.com/s/files/1/0438/7792/5019/files/62053065924.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/62033321483.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/vapopo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000864a.bin
9994511fd1671543447f500023c0964d1c1bc21ff5c1b2af6008075ac703c33b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864A 5272 bytes
font_01_sfnt_off00009824.bin
f2b3a0e5529f640cf515dbcf7e74b40eec6a1741d7da5af63adcdf80becafc33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9824 2572 bytes
font_02_sfnt_off0000a350.bin
cf5cd40117df61b6122e44eaafbd03a84f3cc01a0624e651c3f9dd0980cc1bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA350 10616 bytes
font_03_sfnt_off0000c7c8.bin
e8d9f4f314f71155cb3af5d0c604b40790a475e2ffaa7dac0f486bb944ac92f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 16436 bytes

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