Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c345a5cca51b543…

MALICIOUS

PDF

58.7 KB Created: 2020-08-10 14:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c4008a4f7511e4548e72d507c784007 SHA-1: d50ca2c142d61dc3862413decb76e86223737e93 SHA-256: 7c345a5cca51b5430d46fc730c93c02dc33315c692331763dbf435cbe6e6be03
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, including one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to 'aptitude questions and answers'. The presence of numerous links to external PDF files, many hosted on Shopify, indicates a link farm designed to distribute malicious content or traffic. The ML classifier 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=aptitude+questions+and+answers+for+btech+freshers+pdf
    • http://files.skanlabnorge.com/uploads/1/3/1/4/131437295/5089667.pdf
    • http://tozodut.jenniferhilt.com/uploads/1/3/0/8/130874197/1450440.pdf
    • http://files.universalwellnessconnections.com/uploads/1/3/1/6/131606630/wozujatokevogu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/61804921736.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/14713491343.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/56134160426.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/38054259699.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/tungsten_guide_rod.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/elements_of_ecology_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0451/0928/0933/files/addressing_modes_in_assembly_language.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2736/files/lisodulebidoxiziselug.pdf
    • https://cdn.shopify.com/s/files/1/0433/7909/7758/files/98842857534.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/wonigejezof.pdf
    • https://cdn.shopify.com/s/files/1/0435/8085/0335/files/zebukase.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a14.bin
e5df8793f54e604fff920312007470572f4953f14732a1c134fee01f8fd44b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A14 3256 bytes
font_01_sfnt_off0000a5a6.bin
b69d9d12d5e74c8b526f19f619ed33241cbdbf84f72ecd6552fd2a325174d666		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A6 5556 bytes
font_02_sfnt_off0000b889.bin
612e59faa2463514c8f69ba14d4d40ab56dbc949a4e3580ed61651c704cf412d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB889 10712 bytes

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