Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7d7724d6d649da…

MALICIOUS

PDF

44.7 KB Created: 2020-08-22 18:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20f0e9ea24ce8c5f3e73f88229c7b608 SHA-1: ada289719b3eb4219177cdc98bd30aafb94441a0 SHA-256: 6e7d7724d6d649da97836acfc8d56185b629beecab81c9dd344fce23840e0138
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or redirection attack.

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=caustic+3+android+sequencer
    • http://megetu.nwpwellness.org/uploads/1/3/2/6/132695829/9909082.pdf
    • http://files.infantswimphilly.com/uploads/1/3/2/6/132695352/979480.pdf
    • http://files.operationfreedomdogs.com/uploads/1/3/1/4/131437457/jisosajujesapu_zuwozaxixa_xanazewo.pdf
    • http://vazex.lessonsworthlearning.org/uploads/1/3/0/8/130814229/tubalel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/6620166384.pdf
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/15406799755.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/vutalilobuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/how_to_save_finale_as.pdf
    • https://cdn.shopify.com/s/files/1/0440/1122/5246/files/ordinal_numbers_1_100_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9790/6589/files/imperativo_categorico.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1236/files/58447564484.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/86802648197.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/37416519818.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/medical_certificate_format_for_admission.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_off00007150.bin
070a624d33e7fbc4bcca096925d9f5d766e2ef4deb3999130ce13518b8985690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7150 5096 bytes
font_01_sfnt_off0000829e.bin
80f4bbc8253ded91dd9247bf2170f9b5dbb799c20ebf27feff24314a02d4b546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x829E 10352 bytes

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