Malicious PDF — malware analysis report

Static analysis result for SHA-256 678f2afc51ac2401…

MALICIOUS

PDF

50.5 KB Created: 2020-08-09 01:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f77a36f77e4701ef95287c9151c5d53 SHA-1: dd490c25aa9e49de90c57cf94568ddbd4f1b22fd SHA-256: 678f2afc51ac2401729e54dbd33a24df3fb77923b6eab7c22e5c4a3613dccf27
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 book title, aiming to trick users into downloading files. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm used for SEO poisoning or distributing malware. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=the+bookish+life+of+nina+hill+pdf+free+download
    • http://files.readtoachieve2.com/uploads/1/3/0/7/130775503/nodulajilesusat.pdf
    • http://fujeb.honorfirst.com/uploads/1/3/2/6/132683165/1783758.pdf
    • http://files.wallaceclassroom.com/uploads/1/3/2/3/132303147/nemuzovademake.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3366/4420/files/wanaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/grade_5_math_practice_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/el_deslinde_alfonso_reyes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/libro_para_colorear_de_caballos.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/gawirenegimosadopasuze.pdf
    • https://cdn.shopify.com/s/files/1/0438/9080/2856/files/8553719828.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3506/files/dujijadupepuwifoki.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0051/files/bigomevebepefisuruvil.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/kimedana.pdf
    • https://cdn.shopify.com/s/files/1/0432/5248/2208/files/69980278860.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/inhibidores_betalactamicos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/79714902461.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068a6.bin
71337577fef36e46ce718a09ca2836f03782d5f6ddaf742f46b904026ecd8998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A6 1560 bytes
font_01_sfnt_off00007097.bin
4b2bcf9d4749ee0ac5228b0350d41ba7a370ae17966cf18d8f29c14c82352f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7097 5372 bytes
font_02_sfnt_off000082db.bin
49e1965d72d28bd9a293b2cea0625fb5c0666ba3c20e3293edd5b29f42d73de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82DB 4040 bytes
font_03_sfnt_off000091b8.bin
5dd2435f12206194783f54331c83deec2b6ed7a2b7f27978e288be3d59f7183e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B8 10060 bytes
font_04_sfnt_off0000b431.bin
74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB431 1736 bytes

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