Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa8a3c18134fef8…

MALICIOUS

PDF

83.3 KB Created: 2020-08-08 11:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9aadebdf5309f91fc4f3359d9b8f48c SHA-1: 172bb04dc27061f2f2f2cef70456051d3034662f SHA-256: 9fa8a3c18134fef84551609c18c6b56e43e8f78909f9e28abc4b94b095d927d3
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous external links, many of which point to PDF files hosted on Shopify. A critical heuristic identified one of these links, https://ttraff.ru/pify?keyword=adjacent+channel+interference+in+mobile+communication+pdf, as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'adjacent channel interference' and mentions 'wkhtmltopdf', suggesting a lure document possibly designed to lead users to malicious content via the embedded links.

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=adjacent+channel+interference+in+mobile+communication+pdf
    • http://files.theglowdancecompany.com/uploads/1/3/0/7/130775727/6186860.pdf
    • http://zefevawa.filamenthome.com/uploads/1/3/1/4/131406893/217e14681.pdf
    • http://files.eatingdisorderrecoverymidmichigan.com/uploads/1/3/1/6/131606046/5766502.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/mikasojunufusoramosag.pdf
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/new_holland_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0473/9232/files/cantoral_litrgico_nacional.pdf
    • https://cdn.shopify.com/s/files/1/0434/1740/3549/files/welovalesubabovisutogotiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/0483/6515/files/6718651752.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/87407198686.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/guvukegur.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/10892291990.pdf
    • https://cdn.shopify.com/s/files/1/0434/4312/6438/files/analytical_chemistry_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1465/files/lodoniruzovagiduguveled.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8505/files/xefosuserezime.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_off00010a05.bin
7b3780b0003aa5517467f660ca50616b167c143a1c34e63f4bf06f0c3cff0e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 5420 bytes
font_01_sfnt_off00011c4b.bin
af62272eee9667508d271afb39259d7bddca69efcd09d4e48a8a0e1bc091cc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 10192 bytes

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