Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c7fd1ec55d5304…

MALICIOUS

PDF

41.7 KB Created: 2020-08-07 21:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6f488105bd6b4bab8add611cc5995a2 SHA-1: 702433c0cbcbaddd0df598aa2ee5e302b85d70f5 SHA-256: a1c7fd1ec55d5304f8a9ac524d078f6154fe43af84bc4294bb215d1b3ee210ec
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on platforms like Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same URL as the malicious redirector, suggesting an attempt to disguise the malicious intent as a search result or download link.

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=t%25C3%25A9l%25C3%25A9charger+journal+el+khabar+d+aujourd+hui+pdf
    • http://rekabi.bryanallankrauss.com/uploads/1/3/0/8/130813765/4033650.pdf
    • http://files.shoplblb.com/uploads/1/3/1/4/131437881/4cb7a5daed.pdf
    • http://files.wrladyhornets.com/uploads/1/3/1/1/131164314/1281b6ba7.pdf
    • http://files.amnesialab.org/uploads/1/3/0/7/130775850/gegajotoro_wilinako_womolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/64347499207.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/fenenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0948/2658/files/durovi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2783/9641/files/66545917076.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/95317273131.pdf
    • https://cdn.shopify.com/s/files/1/0451/3703/5429/files/adeptus_titanicus_rules_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/83528756197.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/welimixirupu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8419/9574/files/analytical_solid_geometry_dipak_chatterjee.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3144/files/53531036669.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/39949802500.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a9e.bin
ae332977fbd9c8746ae53af2cfd9201ef676215b30f82f2140030ef1f7f57595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9E 5608 bytes
font_01_sfnt_off00005d68.bin
611c779caf2781f22c096b2fbdc41944bc7a55148313d480e851da69969bd053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D68 10996 bytes
font_02_sfnt_off00008144.bin
740cfdaf8efe689a3c0d13f72548b445463f8dc392617c63c9ea6a8908a698ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8144 16312 bytes

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