Malicious PDF — malware analysis report

Static analysis result for SHA-256 1780af4a0ad61c71…

MALICIOUS

PDF

43.2 KB Created: 2020-08-09 12:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc9e280640f4e7e2b5dc4f09411d7f8e SHA-1: 462270a729c9b9a5f1d0bd2e1bff50b1650ed3ec SHA-256: 1780af4a0ad61c716a1f08db226f89ccb3a8bea19a45875a8ce362ea0eaccc4c
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. One of the primary links, 'https://ttraff.cc/pify?keyword=srs+for+book+bank+management+system+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document body and heuristics indicate a lure to malicious infrastructure.

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=srs+for+book+bank+management+system+pdf
    • http://fixasipu.callyguthrie.com/uploads/1/3/1/4/131482975/lipazomaxib.pdf
    • http://files.townhousecarpet.com/uploads/1/3/2/6/132683080/9273308.pdf
    • http://domoz.trailtothepeople.com/uploads/1/3/1/6/131637254/medutaligeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/convert_string_to_char_array_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/20541013777.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/wetajanejedinufadoluxaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/cactus_mccoy_2_hacked.pdf
    • https://cdn.shopify.com/s/files/1/0433/5806/0703/files/peasants_quest_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0441/3181/1480/files/82335055351.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/77953197897.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/watch_sankat_mochan_mahabali_hanumaan.pdf
    • https://cdn.shopify.com/s/files/1/0438/4066/7810/files/3._5_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/catalogue_cp_cadivi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2011/6387/files/66419279479.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_off00005d8f.bin
ab0dc11e257eb611771f5e667541ea1f22066a7399c250bbf6fcb7d9ef4cab5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 5480 bytes
font_01_sfnt_off00007010.bin
3d28b5694e320f90d03a38b93a997a9e40b63aa8ae6b691f51a21ae82f38167f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7010 9852 bytes
font_02_sfnt_off000091a2.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A2 4324 bytes

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