Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f6b1d783edeed7…

MALICIOUS

PDF

123.4 KB Created: 2020-08-11 14:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f01fff7c1fb30dca1d0edec4199a165 SHA-1: 4dfb8cf4baecbb01b032dda077fbd7ba6f9b85bb SHA-256: 12f6b1d783edeed72078f19c1bfe5c635658bb53a379c7b9e65128a6f2a904d9
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm designed to host other PDFs, indicating a spam or SEO abuse tactic. One prominent link, 'https://ttraff.cc/pify?keyword=arabian+nights+pdf+book', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=arabian+nights+pdf+book
    • http://files.sylviaeneriz.com/uploads/1/3/1/6/131637308/131248.pdf
    • http://beleriza.settlersmuseum.com/uploads/1/3/1/3/131398455/c129685f7.pdf
    • http://files.knockoutcakes.com/uploads/1/3/1/4/131453651/zedogudipifavisuwud.pdf
    • http://files.parkplace-dublin.com/uploads/1/3/1/8/131858661/ee5820c821.pdf
    • http://files.kaylaberghoff.com/uploads/1/3/0/7/130775768/3608372.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/67375702162.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/89899697414.pdf
    • https://cdn.shopify.com/s/files/1/0438/1261/8400/files/zewadududubukozos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9733/files/65712446907.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1915/files/82254250866.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/totexokujibubaduzideki.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/fixagapukigotoxeviwa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4312/5405/files/intruders_tv_show.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001b368.bin
9836701e093522e4e37f606c745482615594975a53def436d76203fcbed08b8b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B368 25028 bytes
font_00_sfnt_off00016eee.bin
dd68e3fac869cf52c632d70c60f1ba95dbf38d16cc4d934e1da49e187b1825f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEE 5464 bytes
font_01_sfnt_off0001816f.bin
bc5103246ec8e67c53634a4d5b78028de12f1cb6b062bb46aaa33448c01d0864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1816F 16396 bytes

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