Malicious PDF — malware analysis report

Static analysis result for SHA-256 65162c120a2c6bcb…

MALICIOUS

PDF

33.5 KB Created: 2020-08-27 14:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7845a5ccbf2b4ba6c68513dd46f6aac2 SHA-1: 27203fde7a86aa81dd771177799a1f02c51503fc SHA-256: 65162c120a2c6bcb75860dd8429611b325015e7e687769e9808aa33a5ac78b1f
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware distribution.

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=introductory+mathematical+analysis+1
    • http://files.paiboon.biz/uploads/1/3/1/4/131406762/1208977.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4125/9671/files/fexikukaxewupenabof.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3296/files/wogiforidafamake.pdf
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/definition_of_international_migration.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/avishai_margalit.pdf
    • https://cdn.shopify.com/s/files/1/0433/5878/1590/files/ar_rahman_music.pdf
    • https://cdn.shopify.com/s/files/1/0443/0397/4556/files/pajifapomiganudowovir.pdf
    • https://cdn.shopify.com/s/files/1/0440/6503/0309/files/datefelezuponusemarejulot.pdf
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/c_singleton_class_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/bibugedijofetaxosimizus.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/my_house_free_mp3_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/pocatello_weather_forecast.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/bejabeximifoluvonodalafe.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_off00004687.bin
7df125db1630073150415bf40781ed6a75ea19fef1ff2440b22933e838c68203
pdf-font-stream PDF embedded font (sfnt) at offset 0x4687 5272 bytes
font_01_sfnt_off00005845.bin
fbd15c110c393df4467e083262bee12117251343f7b6e9b4740e12e6a9a221d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5845 9636 bytes