Malicious PDF — malware analysis report

Static analysis result for SHA-256 02817c1ce7203b30…

MALICIOUS

PDF

38.8 KB Created: 2020-07-22 17:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c0c29db32e8b18165eed8a432826af2 SHA-1: 3630e4b22a3ae2f22da8ea87f70a4559fac0d864 SHA-256: 02817c1ce7203b3053de2a201b2bda6b7f6dff834fbb8a1f28b49bf222c009e4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources disguised as academic materials. One critical heuristic identified a link to a known malicious redirector, indicating a likely attempt to lead the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wb?keyword=medical%20surgical%20nursing%20smeltzer%2012th%20edition%20pdf
    • http://files.anthonypiovesan.com/uploads/1/3/1/3/131379716/kajexilegegok_vigad.pdf
    • http://files.henrycountycancerservices.com/uploads/1/3/0/8/130874599/kedotemutev.pdf
    • http://files.ccw-couchscedarworks.com/uploads/1/3/0/9/130969592/1af54353bfc.pdf
    • http://files.farmsteadproducts.com/uploads/1/3/1/4/131483097/rikukegigije.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/7237/1350/files/35404282841.pdf
    • https://cdn.shopify.com/s/files/1/0439/7488/5534/files/zupawopusulomur.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/fiwazuvunivekozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/buvarajejepemimovifid.pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/gosodubefurifalowisidixej.pdf
    • https://gubakuv.files.wordpress.com/2020/07/vafagupuxinila.pdf
    • https://mosozedegan.files.wordpress.com/2020/06/51028300220.pdf
    • https://gonokerobe.files.wordpress.com/2020/07/xokorovela.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/mijoronegukateb.pdf
    • https://cdn.shopify.com/s/files/1/0429/4665/8463/files/77731995067.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16216600544.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6733015585.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/wefesowuwumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2329/3864/files/raduvorulozija.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/48266540433.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/64597961671.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_off00005848.bin
e0fec12b4d3eacfaaee8d3e5f57556699bce1a63afd383a8a9a5471b5963dc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5848 5688 bytes
font_01_sfnt_off00006b7e.bin
9df670b4323698ec0f7366587eaceea21f2bf12131e143483983dbced37ee653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7E 9380 bytes

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