Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd559fe90fde8db…

MALICIOUS

PDF

44.8 KB Created: 2020-08-14 00:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d435b2a98c843e1d21660ea4569c6c4 SHA-1: a18295dd18937262ca167fa2455f78ba2ef2eed4 SHA-256: 4bd559fe90fde8db66cf62b6677ec995c9672786b80707fbf724cfe6b17760b5
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links. One critical heuristic identified links to known malicious redirector infrastructure at `ttraff.ru`, suggesting a phishing or malware distribution attempt. Another heuristic detected a PDF link farm, with many links pointing to Shopify-hosted PDFs, likely for SEO manipulation or to obscure the true malicious destination. The document body is heavily obfuscated and contains a URL that appears to be a 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=bournemouth+and+poole+college+sixth+form
    • http://files.raypecbasketball.com/uploads/1/3/0/7/130738619/9820176.pdf
    • http://sixisi.equinecountryusa.com/uploads/1/3/1/3/131384635/bojufowakenezober.pdf
    • http://dowove.benefactoryllc.com/uploads/1/3/1/1/131164250/gisilizov.pdf
    • http://files.alexandra-karl.com/uploads/1/3/1/4/131438784/c85e4b66db.pdf
    • http://files.rayzinktattoo.com.au/uploads/1/3/1/4/131453177/korugiviwujepaseb.pdf
    • https://cdn.shopify.com/s/files/1/0440/4353/4486/files/pikopogunexubeli.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/77315073794.pdf
    • https://cdn.shopify.com/s/files/1/0434/5384/1560/files/57201446427.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/nomuroji.pdf
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/poemas_de_amor_gustavo_adolfo_becquer.pdf
    • https://cdn.shopify.com/s/files/1/0432/5215/4532/files/jisuvufavek.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/barcelona_city_map.pdf
    • https://cdn.shopify.com/s/files/1/0448/1892/3686/files/polisacaridos_en_alimentos.pdf
    • https://cdn.shopify.com/s/files/1/0431/7485/4820/files/wunerele.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/ludaxi.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_off00006e4a.bin
cf36f8eb88744c8f27ae5453fd023e5f5ded691656aaa7b37bfb8219dc934042
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4A 5688 bytes
font_01_sfnt_off0000817a.bin
04ba24439c79575ce6c0bb3f922254fc8576f7c76268e1ab97c0238c5fc2f2e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x817A 10652 bytes