Malicious PDF — malware analysis report

Static analysis result for SHA-256 616b6cd55b63168d…

MALICIOUS

PDF

49.9 KB Created: 2020-08-04 06:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b21b301172d0265e9b6922c8a4677274 SHA-1: 64be0afd37b0cc380e32e9726b4255a5f2a5037c SHA-256: 616b6cd55b63168dc39c1806b5c7b2239bbfeba9c3a4e69c6721a9aeffc69193
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external PDF links, many of which point to a redirector. The primary redirector URL is `https://ttraff.cc/pify?keyword=bangla+comic+book+pdf+download`, which is flagged as malicious. This suggests the document is designed to drive traffic to malicious infrastructure, likely for further exploitation or malware delivery. No scripts were extracted, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users.

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=bangla+comic+book+pdf+download
    • http://files.swedesthewaytheywere.org/uploads/1/3/1/4/131437655/modixu_bududoxaz_gutebelozoganof_pebutosejajiwek.pdf
    • http://files.merrychristmasfromthewades.com/uploads/1/3/1/3/131381480/muxukivizo.pdf
    • http://sevir.kengoesclick.com/uploads/1/3/0/7/130775732/0b2925e81ab9.pdf
    • http://files.michaelmorrisnz.com/uploads/1/3/0/9/130969543/316761.pdf
    • http://files.travelbaseballrankings.com/uploads/1/3/2/6/132682342/kowixepevasoj-barubibuxegav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/kavopomuwumifuruz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/22405057316.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/98144080358.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12247178291.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/60896949877.pdf
    • https://cdn.shopify.com/s/files/1/0437/2335/8358/files/43151890772.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43127542751.pdf
    • https://cdn.shopify.com/s/files/1/0435/3359/8880/files/rimepejomesatovirile.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/nukifovimusevalugebipop.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/35864430385.pdf
    • https://cdn.shopify.com/s/files/1/0437/4308/4705/files/zilulavup.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005560.bin
f329e86135b75f998e68ed67f4dff4eba714366bbf6523b336ad540ebf5cac46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5560 5544 bytes
font_01_sfnt_off00006843.bin
e5867db363b0490ffb6361611ccf02ff2dc1e23efc948dcb17fb0527d4d4f1bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6843 8264 bytes
font_02_sfnt_off0000823e.bin
e0f2cd70b8470a5a886bd48790d5e73287ac534fd0195f8b4bacd635f15a6fa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823E 9880 bytes
font_03_sfnt_off0000a444.bin
954f30c1cce2e3a00f07cb0ababb04bf86a3a3c34ed8da2fc782bdc014231390		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA444 16392 bytes

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