Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7293b233327a1c…

MALICIOUS

PDF

49.0 KB Created: 2020-08-11 21:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b74f3250108863881d1bd311c8120e SHA-1: 051c52f5a98ea6130f04e0a0bb4fa08039d59605 SHA-256: 5f7293b233327a1c3f8b329ac5bfd5b51906e82e4c65dbc1a71e0052f8910acc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure known for malicious activity. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating an attempt to direct users to potentially harmful content. The ML classifier also 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=ctet+syllabus+paper+1+and+2+pdf
    • http://nitasunux.sweetsituation.com/uploads/1/3/0/8/130814017/71799.pdf
    • http://riwabepi.timsbikeshop.com/uploads/1/3/0/8/130814526/f8f592e527e066.pdf
    • http://files.mrgraney.com/uploads/1/3/2/6/132681144/cdb69af5f09f4b.pdf
    • http://wixiwo.greatergoodconsultantsct.com/uploads/1/3/2/3/132303382/fabomesoroja-runefanobusoxar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/92248075620.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/important_days_in_year_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/bibatudopegumufupavas.pdf
    • https://cdn.shopify.com/s/files/1/0429/0514/1411/files/81497877220.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wijabogose.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/zagidos.pdf
    • https://cdn.shopify.com/s/files/1/0439/3353/2315/files/arbitrary_waveform_generator.pdf
    • https://cdn.shopify.com/s/files/1/0428/5490/8071/files/kadarudolulimafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zaxolaxowixinetubosi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/pesodegufaroxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/50363110585.pdf
    • https://cdn.shopify.com/s/files/1/0438/5816/5925/files/72455838997.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_off000073b8.bin
3c33e0c1b3b7ed7da54a9bd3fe0be65baa4c08669863903c330a1303c9aa4299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B8 5208 bytes
font_01_sfnt_off00008581.bin
ae608664b9aa075444078bdbfd57fdff4b017068ab80868e996c233dacd1b344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8581 10464 bytes
font_02_sfnt_off0000a8d4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D4 4324 bytes

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