Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c13dfbb42bf15a…

MALICIOUS

PDF

40.6 KB Created: 2020-08-20 21:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9abb58e6654de99be6e3eda1174cf62b SHA-1: 17ec63354d718b5ee9b6a910d77e62c14ac2d8f2 SHA-256: 66c13dfbb42bf15ad6a2319dd0c09a25f5ef04e353ea8b1037a67d5a85f2f99c
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links, including a malicious one, suggests an attempt to redirect the user to malicious infrastructure, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded links indicate a malicious intent.

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.cc/pify?keyword=free+online+twitter+hd+video+er
    • http://mimomu.jjkbarrelracing.com/uploads/1/3/1/3/131380771/5f7c41a.pdf
    • http://naduvi.starviewucc.org/uploads/1/3/2/8/132816202/natawo.pdf
    • http://mixuno.artfulscents.com/uploads/1/3/2/7/132712237/44e18.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6662/2106/files/boss_card_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/funny_questions_and_answers_jokes_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2183/files/xowawajokudevozadag.pdf
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/aprendizajes_clave_sexto_grado_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/71856807631.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/tutorial_aegisub_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0440/1148/7397/files/royal_120dx_cash_register_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/56579408710.pdf
    • https://cdn.shopify.com/s/files/1/0440/7921/8838/files/insect_encyclopedia_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0435/6122/2307/files/sylvester_stallone_nude.pdf
    • https://cdn.shopify.com/s/files/1/0447/7334/3383/files/temperamento_melancolico.pdf
    • https://twitter.com/PassengersMovie/status/821025484150423557
    • 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_off00006196.bin
31ec8c069130e1b317baeb293ee6bccf2ef800a1c556d24254015a71d460b0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 4632 bytes
font_01_sfnt_off00007163.bin
cc13c54d3cbf819a8aa5b2149bda2742722bddf9a19b99b719799357b34ab824		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7163 10624 bytes

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