Malicious PDF — malware analysis report

Static analysis result for SHA-256 09125dc3972c0c97…

MALICIOUS

PDF

42.7 KB Created: 2020-08-18 16:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33ff901c89084875d2858a423f73a9ef SHA-1: 6ce047ab6938dd4f5131f7ec4ffef7582475fa81 SHA-256: 09125dc3972c0c97c71ee8145bca0b754338e0bd9e4582dfeb27d0f36cdfb427
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for 'digital electronics gate questions pdf'. This link points to 'ttraff.ru', which is flagged as malicious. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, likely used to obscure the malicious one. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=digital+electronics+gate+questions+pdf
    • http://files.in2improv.org/uploads/1/3/0/9/130969910/kojuwodela.pdf
    • http://files.thepinkmixingbowl.com/uploads/1/3/2/3/132303012/jizeverinaju_fipili_gefiwujujapem.pdf
    • http://files.jonathaneickhorst.com/uploads/1/3/0/9/130969389/bimake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/vijuwarifubolokelunojesox.pdf
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/calorimetry_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/cbr_test_practical.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/10406898395.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/65526241451.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8127/files/95492759932.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/in_my_life_beatles_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0439/5198/0712/files/gamotejameximemerame.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/aptransco_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/hemoglobin_concentration_test.pdf
    • https://cdn.shopify.com/s/files/1/0436/1427/3693/files/catia_v5_learning_books.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/72058548475.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065f6.bin
d22a9fd1e579e29c4f66f002a76743e0b2467117630e0025c5135ed713f7398a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F6 5448 bytes
font_01_sfnt_off00007880.bin
a6377458912678c323f2e42c53c1c631f001f8b9f92a57d5d0face429d5f05ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7880 10928 bytes

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