Malicious PDF — malware analysis report

Static analysis result for SHA-256 478328785d6f31e2…

MALICIOUS

PDF

39.4 KB Created: 2020-08-18 16:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96af9c222f4b547977e437863cf589ea SHA-1: 5456b8377cb13c62b9c4189c6f855660cf736da8 SHA-256: 478328785d6f31e2ba65ed69ed758da60e15e906f5d8c2146ea5f1880eb2587f
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic SEO content, with one prominent link leading to a known malicious redirector. The document body, though partially garbled, contains the text 'Congenital calcaneovalgus foot deformity' and the malicious URL, suggesting a lure to a scam or phishing site. The presence of multiple embedded links to external PDFs, many hosted on Shopify, further supports the link farm heuristic.

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/pify?keyword=congenital+calcaneovalgus+foot+deformity
    • http://files.nwhsmsa.com/uploads/1/3/0/7/130775977/lakakigoxed.pdf
    • http://pivojora.serradesigncollective.com/uploads/1/3/0/8/130814328/neridade-dexivelad.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/romakuzi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/xepuwewotitularef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/timuleki.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/graphic_design_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/naxobebotabewowujiresoba.pdf
    • https://cdn.shopify.com/s/files/1/0460/6001/1675/files/beauty_camera_now.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/tinor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9517/files/84382000382.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_off00005c44.bin
7c4e90798109030c943300725b956616abdac3869c19854bdbce8a02e185b846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C44 5408 bytes
font_01_sfnt_off00006e9f.bin
50adfaad7918fe6204f94f4a438e7622845f86ad3fa48c9dd293fcb18d29ef37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9F 10128 bytes

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