Malicious PDF — malware analysis report

Static analysis result for SHA-256 879dd3b5ffe3de5a…

MALICIOUS

PDF

114.8 KB Created: 2020-08-22 06:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30048c31811009a6dca69e74bcf3c9cc SHA-1: c8b5f23c2ed7f82f15998548b29fc24b339e0cfa SHA-256: 879dd3b5ffe3de5a2ac58f6a49aaf494fa18e1ad45245ce581e49715704d8a23
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=metformin+mechanism+of+action+in+tamil', likely leads to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, some of which are also suspicious. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=metformin+mechanism+of+action+in+tamil
    • http://damekofiv.floraindianadepot.org/uploads/1/3/0/7/130775432/mumel.pdf
    • http://files.suzi-little.com/uploads/1/3/0/9/130969046/c4449ffdf0.pdf
    • http://files.mortarboardatucla.org/uploads/1/3/1/0/131070604/xijetujena-xugufaxewegef-nifix.pdf
    • http://files.ivypnw.com/uploads/1/3/2/6/132683014/kupelonagidifugon.pdf
    • https://cdn.shopify.com/s/files/1/0436/3046/1081/files/descriptive_versus_inferential_statistics_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/17443217103.pdf
    • https://cdn.shopify.com/s/files/1/0427/8625/9100/files/fever_of_unknown_origin_pediatrics.pdf
    • https://cdn.shopify.com/s/files/1/0437/2122/8442/files/bloodborne_bastard_of_loran.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/angel_has_fallen_movie_300mb.pdf
    • https://cdn.shopify.com/s/files/1/0466/7952/3493/files/jutukufujuzitukadowadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/laxotogaromubilem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8076/files/mipabonoruger.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_off000157b8.bin
572cc28059c90e6d6f4328487bd6845beddc7e66639e785e58119e3bf7de249f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157B8 4916 bytes
font_01_sfnt_off00016834.bin
6edf8e65bf45eeee509e3565ef62d0e910b917cb74188568b49d7039895ef43b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16834 15264 bytes
font_02_sfnt_off000198a2.bin
007a374aec5d4d45bbdc67fde3c8c94fc6ccc240ada643b27ad8df5a7c26b0c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x198A2 16160 bytes
font_03_sfnt_off0001adb2.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADB2 4324 bytes

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