Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb057ce7887cf5dc…

MALICIOUS

PDF

35.2 KB Created: 2020-06-06 15:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3c881d462586dd2f8c2598c3e9f2a77 SHA-1: fce5a075e1d760dbf130aea809fdb5f11babbb20 SHA-256: bb057ce7887cf5dc4e56b80da72c2c5c1f53cc55f729ff9cc672489faea24ae9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains some of these URLs, suggesting the primary purpose is to redirect users to a link farm, potentially for SEO manipulation or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://fireflycustoms.org/uploads/1/3/0/6/130640162/130640162.html#envoy+izle+t%25C3%25BCrk%25C3%25A7e+dublaj
    • http://hillprints.com/uploads/1/3/0/3/130379146/mejosoted.pdf
    • http://erictharris.com/uploads/1/3/0/7/130740492/sineladenojeled_jafomesidoge_pufabiwepeko.pdf
    • http://diamondrawtresses.com/uploads/1/3/0/2/130292073/37cc2394dc.pdf
    • http://lingwow.com.br/uploads/1/3/1/3/131379118/ccb99fa3485.pdf
    • http://host129.carmichaelnl.com/uploads/1/3/1/1/131163693/rulekuxoxovaf_jatetufojevevu_nawag_fobawazuvobuped.pdf
    • http://my-cwb.com/uploads/1/3/0/7/130740145/dexoz-jatituwodatid-wiwirar-tobegagoma.pdf
    • http://northshorepaintinginc.com/uploads/1/3/1/4/131455141/9689738.pdf
    • http://goldcoastfamilybakeryandcafe.com/uploads/1/3/1/4/131482950/tidalamiv-zananenila.pdf
    • http://plaidacres.com/uploads/1/3/0/2/130288522/kawokifuf.pdf
    • http://fireflycustoms.org/uploads/1/3/0/6/130640162/terms.html
    • http://fireflycustoms.org/uploads/1/3/0/6/130640162/dmca.html
    • http://fireflycustoms.org/uploads/1/3/0/6/130640162/policy.html
    • https://jurajagu.files.wordpress.com/2020/06/lekejimofis.pdf
    • https://taguvef.files.wordpress.com/2020/06/96670485654.pdf
    • https://wufabok.files.wordpress.com/2020/06/dumirimaro.pdf
    • https://vesuduk333682907.files.wordpress.com/2020/06/labasuximugibidogojunas.pdf
    • https://jumalorapof.files.wordpress.com/2020/06/dakawuxajedatapu.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005911.bin
ae8678b3a5286a1807be8e92ad5fda7a02f389caee6425aaaf25548f23da465d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5911 12148 bytes