Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d55da53798c4e58…

MALICIOUS

PDF

38.0 KB Created: 2020-08-30 22:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b513afade53cc62d108ee7173161c303 SHA-1: da1ea9f7e230789877cd618dde675a7534e38df5 SHA-256: 8d55da53798c4e5870d2a977c015773d60cf7412eef515f070c4a5a2d49fb2e6
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector. The document body and heuristics indicate a lure for a 'full wave rectifier pdf download', which is likely a pretext to encourage clicking the malicious link. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic to increase visibility and click-through rates to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=full+wave+rectifier+pdf+download
    • https://cdn.shopify.com/s/files/1/0431/4624/8358/files/ritulukudafela.pdf
    • https://cdn.shopify.com/s/files/1/0438/1874/6013/files/xubevepakolimeses.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2214/files/71708525124.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/xixizawukib.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/78597538571.pdf
    • https://cdn.shopify.com/s/files/1/0434/5505/3989/files/japekatotagisizuzojofa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7867/files/muxepakiligiwupuda.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/biomass_based_power_generation.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/31976246928.pdf
    • https://cdn.shopify.com/s/files/1/0455/5178/0005/files/natural_causes_of_air_pollution.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/18572055820.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7190/files/60089958304.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_off000059d4.bin
2bad4e19314574b756af70bf9173ae8912432319040fb905d676d0a572af8cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59D4 5076 bytes
font_01_sfnt_off00006b3f.bin
8b08dabb844a468fdeb93cd2b72dc7f342032c01f9c61933138e166c075c49be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3F 9488 bytes

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