Malicious PDF — malware analysis report

Static analysis result for SHA-256 4453a23dc83520ad…

MALICIOUS

PDF

47.5 KB Created: 2020-08-13 05:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2427171a22f619be0929b99319b39492 SHA-1: c3bfacd04914a0cd93c68af2a94da3faaf0faafb SHA-256: 4453a23dc83520ad625ed79880ce388ff09bb1040f6f08effb4306e5b7e746a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'types of topology' and includes the malicious URL, suggesting a lure to a malicious site. The presence of many external PDF links also indicates a link farm strategy, likely to improve SEO for malicious content or to distribute traffic. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=types%20of%20topology%20with%20diagram%20pdf
    • http://teboxara.deanhunt.net/uploads/1/3/0/7/130776031/8274030.pdf
    • http://taviw.boomerangsandrings.com/uploads/1/3/1/6/131606490/biduxituteken.pdf
    • http://fijolil.silverrivercoaching.com/uploads/1/3/1/3/131384169/wuravevagonizuji.pdf
    • http://kawud.littlehartspreschool.com/uploads/1/3/1/4/131437363/9df6c0.pdf
    • http://files.towncreekvision.com/uploads/1/3/0/7/130775357/feduku.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/69023554003.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/51104323362.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41326774972.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3411/files/14073681965.pdf
    • https://cdn.shopify.com/s/files/1/0453/3600/2715/files/data_structures_and_algorithms_with_scala_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8932/files/66667797468.pdf
    • https://cdn.shopify.com/s/files/1/0434/7818/8198/files/pixar_storytelling_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/pokadaxuguniv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/betegapi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0292/7003/files/waxowefaxekefudadavururo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/24431255196.pdf
    • https://cdn.shopify.com/s/files/1/0428/5490/8071/files/48373280343.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/the_red_army_and_the_second_world_war.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f3e.bin
b78903524d338140662e49f713d436fea06b4f98e2c16a16bf76292a8564d2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3E 5280 bytes
font_01_sfnt_off0000814d.bin
027834a0b0dc6c2b43b6f4cdaa27d8765b7d6c4552cd326a4cbe0f8a444d7d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814D 9780 bytes
font_02_sfnt_off0000a2d6.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D6 4324 bytes

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