Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f5ebc44dde8044…

MALICIOUS

PDF

44.7 KB Created: 2020-07-29 18:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db157d55f098c409dd4ce44923bc10ca SHA-1: 26a3469425b499418ea3f5486a3ea61b25a7d6b2 SHA-256: d7f5ebc44dde804490cf6117eb9b82c0405c9fa50f427657bfa6034e5223e1eb
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. Another heuristic points to a 'link farm' with numerous external PDF links, suggesting a coordinated effort to distribute malicious content or conduct phishing. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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=cerebro+creativo+pdf
    • http://files.countryrddesigns.com/uploads/1/3/1/6/131606467/58faced59eca.pdf
    • http://files.advantageauburn.com/uploads/1/3/1/4/131455283/685774.pdf
    • http://files.ccjrstudios.com/uploads/1/3/0/8/130813764/8403465.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11085861466.pdf
    • https://cdn.shopify.com/s/files/1/0432/6984/9246/files/81055660300.pdf
    • https://cdn.shopify.com/s/files/1/0434/3722/8188/files/99862536571.pdf
    • https://cdn.shopify.com/s/files/1/0435/2324/4191/files/59916878704.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/32948198628.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/66290592543.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2236/9446/files/vuwonudizilajigotow.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5312/files/togamobavugizirefaza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80023348890.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4573/files/38456395038.pdf
    • https://cdn.shopify.com/s/files/1/0430/1481/5901/files/53610472641.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38970143778.pdf
    • https://cdn.shopify.com/s/files/1/0432/9301/6222/files/xezavigaw.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/
    • https://cdn.shopify.com/s/files/1/0431/6397/58

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070c8.bin
6df60e57af78c5ac7f73848ad352e990458e3eecc8d1fceb9a4485bcd7c92cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C8 4844 bytes
font_01_sfnt_off00008150.bin
33faf09263a7e24acc118260197ef9cbebe90d300ded4a8c51779eb39ce8e248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8150 10720 bytes

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