Malicious PDF — malware analysis report

Static analysis result for SHA-256 16778c6fde1cbf7c…

MALICIOUS

PDF

125.2 KB Created: 2020-07-31 13:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e9072bf46dec115d0938fff533ecf4e SHA-1: 181c4c6b6503f588bd03741ae448082572a3a35a SHA-256: 16778c6fde1cbf7c44bb803fc50fa32348f06f82feaff65dad7ed02bcf5b3ac0
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'Bridging and bonding social capital pdf'. The presence of numerous external PDF links also points to a link farm or redirection scheme. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

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=bridging+and+bonding+social+capital+pdf
    • http://files.andersonolineacademy.com/uploads/1/3/2/7/132740978/vulutaduk.pdf
    • http://files.biggulpcastnets.com/uploads/1/3/0/7/130739415/nusujemewi-faran-zijubejatawuga.pdf
    • http://files.learningsupport.shenfieldlearning.com/uploads/1/3/0/8/130874026/terif.pdf
    • http://files.lifewisegifts.com/uploads/1/3/0/8/130874128/6ab8d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3890/7288/files/47747383489.pdf
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/12186340651.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/65902374526.pdf
    • https://cdn.shopify.com/s/files/1/0432/0565/6736/files/zikegaraxokudoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/6132449663.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/togobojome.pdf
    • https://cdn.shopify.com/s/files/1/0433/0343/6446/files/36229803682.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/34367823097.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4746/files/83792507132.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/sewopewodolirutozefa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/26128525680.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_off0001a7ff.bin
20ecb7cc3716411211c78dced9bad39e3917e6e143967a700a92b9dbfad2b5ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7FF 5180 bytes
font_01_sfnt_off0001b995.bin
1195a652c0715eecca9ba69d42cd354b315071a42170c08e89e1d59f36cc5a59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B995 14532 bytes