Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbf0442e07a29a3…

MALICIOUS

PDF

68.6 KB Created: 2020-08-12 13:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57de840b0f6ec67bfe0e97104c606829 SHA-1: a2573a42c563331c299aab5d78778ed3ce172862 SHA-256: 6cbf0442e07a29a39b5c0452bbbf17c33f2e23025bc7128ecf9bcc27dacfee2c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a PDF link farm and another flagging a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary purpose is to lure users to malicious sites, potentially for phishing or malware distribution.

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/pify?keyword=acrostiche+d+amour+pdf
    • http://sojos.coppertopbbq.com/uploads/1/3/0/7/130775934/c1c872eb.pdf
    • http://files.newhopeakron.com/uploads/1/3/1/3/131398487/546fc3.pdf
    • http://files.maplepta.com/uploads/1/3/1/0/131070846/2867490.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/43503604950.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/49543961890.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/46297116177.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/zexutijuwudozileja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74832969368.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/download_brunner_and_suddarth_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/51104851424.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/gujexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/72083010484.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/44027891045.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7191/files/javascript_object_length.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac30.bin
a0860986fe10610675972d922dd2fe6f7841fa05d8aef3c12f3f9050834f04ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC30 5128 bytes
font_01_sfnt_off0000bd9b.bin
542f2dcbbee9e56214caae8833619b53eb2391e92868b9b1ca768ca6cb8dd2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9B 10472 bytes
font_02_sfnt_off0000e117.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 16312 bytes
font_03_sfnt_off0000f6a2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 4324 bytes

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