Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c720d9425b6d70d…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 08:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d87a6fdd6c4e5372ed8c1de7f9b4e851 SHA-1: e4f7262a041d76b0437c15eb329f796628dce384 SHA-256: 8c720d9425b6d70dda1714723d314d03029a2ba5610d4e3cb79058e1e612eeee
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=ac+odyssey+best+mastery+levels'. Additionally, it functions as a link farm, embedding numerous external PDF links, many of which point to benign content. The document body contains garbled text but also includes the malicious URL and several benign URLs. No scripts were extracted from this sample.

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/wix?keyword=ac+odyssey+best+mastery+levels
    • https://static.usrfiles.com/ugd/0c4177_eb1f111e46264eec898c41fdd86b1cd7.pdf
    • https://static.usrfiles.com/ugd/b58d21_a9da92489108481cb6f79705169acee9.pdf
    • https://static.usrfiles.com/ugd/0aab01_306ceb66294d464da91ff89087aeecce.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/48456180421.pdf
    • https://cdn.shopify.com/s/files/1/0438/4466/5506/files/fomawar.pdf
    • https://cdn.shopify.com/s/files/1/0429/5596/4569/files/siwoxizaluxekewega.pdf
    • https://cdn.shopify.com/s/files/1/0433/2614/4670/files/tuzevefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3219/0876/files/94802678623.pdf
    • https://cdn.shopify.com/s/files/1/0434/6232/8472/files/fesulojarejibibamujon.pdf
    • https://static.usrfiles.com/ugd/1d64af_72c9f3eda556430583e2b06baf5942d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b598d61539d341b69596c25235f27f7c.pdf
    • https://static.usrfiles.com/ugd/e4ff69_d359315ad5e74884856b36b59b0365fe.pdf
    • https://static.usrfiles.com/ugd/a91264_8f241888dca3485cadccba28aea9794c.pdf
    • https://static.usrfiles.com/ugd/0c41e7_c9085b0ec956464295cb08fc402e6f17.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_off00006709.bin
7bb5be241bd3e706dea148e4579ee26978e3b958eb7c1202f59a28e0c829bc33
pdf-font-stream PDF embedded font (sfnt) at offset 0x6709 5376 bytes
font_01_sfnt_off0000793e.bin
73a0f9d9920d247a245b868af63fee1bdbc545b7cac21467a647f995d57adf4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x793E 14036 bytes