Malicious PDF — malware analysis report

Static analysis result for SHA-256 0869d24a91a4ee90…

MALICIOUS

PDF

44.2 KB Created: 2020-07-27 16:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0857a5007083ceeca6b674b7540ce479 SHA-1: a52d78d6d6c85d7e73d787c580d6a73c0a94ece5 SHA-256: 0869d24a91a4ee90d02e5e268f925bc7ebcdb742f25ff97d988f132a0a2e062b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, flagged as a link farm, directing users to external sites. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links suggests an attempt to lead users to malicious content or phishing sites.

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.cc/pify?keyword=apache+index.+php++file
    • http://files.therestthatworks.com/uploads/1/3/1/0/131069763/db6fd3f24b7c.pdf
    • http://files.ogormemphis.org/uploads/1/3/1/3/131381374/770b2a7eadd9.pdf
    • http://files.thehoneybcompany.co.uk/uploads/1/3/1/4/131437319/590733.pdf
    • http://files.st-john-aptos.org/uploads/1/3/0/9/130969742/f7cdda1b44c23c3.pdf
    • http://files.ithoughtidbemarried.com/uploads/1/3/1/3/131380730/faxokaruzowow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/gadejofaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/90735709657.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/kelamajebirotadus.pdf
    • https://cdn.shopify.com/s/files/1/0433/2870/0571/files/gikej.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/sasazederajudu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/51576444939.pdf
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/79117765294.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0841/files/saneda.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/kitim.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0655/files/nimiremimaletewuxemanumir.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4677/files/zijoguwudilamimalef.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007182.bin
b273816a3cc1a552cc1483d488299e66eac3e87cdd92a637d4af7f1c094fe282
pdf-font-stream PDF embedded font (sfnt) at offset 0x7182 4656 bytes
font_01_sfnt_off0000814b.bin
f1c368c1e5bbbcaa24eeac9b73a6c743031d2c9505ebf161b861666cc76f4ca0
pdf-font-stream PDF embedded font (sfnt) at offset 0x814B 10164 bytes