Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6f583680d1fc8f…

MALICIOUS

PDF

37.6 KB Created: 2020-08-24 10:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b20a755744dcca283d20d6a6ff0bf808 SHA-1: adffc71254e1fb587f54e33d615897df06eda86a SHA-256: 6b6f583680d1fc8fa926152a40b5f80a5d976e47405b898741c4410d934a5309
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. One prominent URL, 'https://ttraff.cc/pify?keyword=aws+cli+cloudformation+validate', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=aws+cli+cloudformation+validate
    • http://mulivu.marleemoses.com/uploads/1/3/1/3/131384281/5326932.pdf
    • http://files.botanicaibukoleshop.com/uploads/1/3/1/4/131437792/209958.pdf
    • http://files.eddefenseleague.org/uploads/1/3/2/7/132740805/2009417.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5874/7800/files/kiwaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/62574699927.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4629/files/26668494868.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9037/files/peoples_encounter_movie_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6308/2146/files/mission_mangal_movie_songs_bestwap.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/vowigofarukorazuvololo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2163/7544/files/58594289184.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_off00005446.bin
8b218c3b45d597b84fe7662f393cd3d397aaf74ceb6bf0c9ee2e58337aa55fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5446 5308 bytes
font_01_sfnt_off00006642.bin
c5f62a15e93bb49bdfac56f303606d97cdb93ce4b3a99eae1b9216be990320fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6642 10476 bytes