Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a659fb871a0b9b…

MALICIOUS

PDF

51.9 KB Created: 2020-08-04 23:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 307fc658700c6f57c53a57af7a44fed9 SHA-1: 2369ef7263746902eac7a3ac0a94beaac8c2cfe4 SHA-256: 74a659fb871a0b9b27d75dd29a17b54e5c5b8aeec9e88a5baff67e1fdea8bafc
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is flagged as malicious. The document body, though heavily obfuscated, contains text suggesting a lure related to 'hackerrank problems and solutions pdf'. The presence of numerous external links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to increase visibility of the malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.ru/pify?keyword=hackerrank+problems+and+solutions+pdf
    • http://files.phoenixhypnobirthing.com/uploads/1/3/1/3/131379060/jijawori.pdf
    • http://files.alittleforkedup.ca/uploads/1/3/1/4/131406592/bozetakipomozoz.pdf
    • http://files.energylabnordhavn.com/uploads/1/3/1/3/131381363/bipabukonobeba_vodonavefi_bedex_zorene.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/94228939163.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/how_to_create_a_local_server.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4589/files/pagugerugosobekuvo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5199/7592/files/gregory_isaacs_night_nurse.pdf
    • https://cdn.shopify.com/s/files/1/0432/4222/5831/files/install_mongodb_ubuntu_15._10.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/the_walking_dead_s07e02_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/pamegosugozejikuzisekemep.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/nokapewedafenawam.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/dudinujiwazupufezaribax.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006914.bin
7123c8814306d14134f12963746e07af61482ea7032f81379a593db0e02ddc7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6914 5348 bytes
font_01_sfnt_off00007b16.bin
34a377f5afda4ab605901993bb1a3a9329c60db7e8c34ee4dccc9bb4dcae0a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B16 10352 bytes
font_02_sfnt_off00009e7b.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7B 16312 bytes
font_03_sfnt_off0000b406.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB406 4324 bytes

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