Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e259abb3c43628…

MALICIOUS

PDF

43.6 KB Created: 2020-08-14 17:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e285bbd60fdfee0e562701dbff19a73 SHA-1: 9c90b85ea3ba5d6fc1be65fabd8e9b7d22723d36 SHA-256: b9e259abb3c43628e2e876360168cfb971d6d6d9138cb49d0e919a72127d87d9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL pointing to a redirector, suggesting an attempt to direct users to a malicious site, likely 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=cashbook+spreadsheet+template
    • http://files.bobbybrownstaxidermy.com/uploads/1/3/0/7/130775192/6567bf.pdf
    • https://cdn.shopify.com/s/files/1/0441/2515/9576/files/reveberusotijemola.pdf
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/76640917769.pdf
    • https://cdn.shopify.com/s/files/1/0431/0764/7639/files/denonerifamotuwamo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0163/4201/files/24236650018.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/99026529221.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9034/files/plural_form_of_diagnosis.pdf
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/29879444392.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/35470093210.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5636/files/surgical_asepsis.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/51841420325.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c4c.bin
4f67a76210c92eef3b57aa70a0bd0c134e97d80980d560d2ea4b588b63aec73b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 5308 bytes
font_01_sfnt_off00007e22.bin
23a4dd6e5f353971388a2d5b43d9f9975d3b7ac484d2e4262091d9cdaabe9db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E22 10348 bytes

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