Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9daf2173bef6a58…

MALICIOUS

PDF

51.4 KB Created: 2020-08-19 05:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaf41b3981f89f5414dc0947019c8a21 SHA-1: 35131c6ce90732822b45f16396d888ca08a4f60b SHA-256: c9daf2173bef6a580cc6016209363bd8127d3198faa74f167c16a5927d6e5716
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as "Antenna design software for android". The document also features a large number of links to external PDFs hosted on various domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of multiple external links reinforces this assessment.

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=antenna+design+software+for+android
    • http://files.wissamsouss.com/uploads/1/3/1/8/131856134/guxazader-vemefobajumi.pdf
    • http://files.calgarymemorial.com/uploads/1/3/0/8/130874305/fd7bcc08e.pdf
    • http://diwup.thisbostonlife.com/uploads/1/3/1/1/131164250/lujogujigo-jezutegago-mizamonazowi.pdf
    • http://files.dudleycameraclub.co.uk/uploads/1/3/1/3/131398560/gawowived_wutezipigapim.pdf
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/3d_exporter_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mokotutirajozejimus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/15009697373.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/migidanovamu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9283/files/42313497816.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5653/files/watigemen.pdf
    • https://cdn.shopify.com/s/files/1/0428/8479/2479/files/xofawotepulewasubukazaw.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_off00008b4e.bin
150d838d689c5403ceab089f9e29f0b5993a80a1cd7f552d84aa9f0b87855447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4E 5124 bytes
font_01_sfnt_off00009cd8.bin
1c4eb47bb2c1f9bbc837f439b49042f2ebec062116667b96bc878cba748da0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD8 10652 bytes

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