Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f06ec3168bad5da…

MALICIOUS

PDF

43.2 KB Created: 2020-08-06 22:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0044545cc76a114355c9e3c61a5e22c9 SHA-1: 43cbb78efb4e97c6383f0a2197ede052ebab8fe7 SHA-256: 7f06ec3168bad5da064b9cac3c71179005aa3455c18e54fb1f38111fb0657325
162 Risk Score

Malware Insights

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

The PDF contains a deceptive link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure for free educational materials, which is a common tactic for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=education+brochure+design+pdf+free+download
    • http://files.rewritingourstories.com/uploads/1/3/0/7/130739128/e80a99a44c2.pdf
    • http://files.uclarisestudy.com/uploads/1/3/1/8/131857199/9989551.pdf
    • http://files.toriholder.com/uploads/1/3/1/3/131380756/5a496cd.pdf
    • http://files.projectkindnessok.com/uploads/1/3/2/6/132696621/xakavolute_sikazametabe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/vanesakekotifawaxesukilis.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/30395724150.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/aqeedah_tahawiyyah_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/62217484059.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0647/files/70412956311.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/zipanuroxita.pdf
    • https://cdn.shopify.com/s/files/1/0449/8512/2984/files/gta_5_ps3_cheat_codes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7746/files/17927845072.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/chipotle_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/43826167705.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/what_permissions_should._ssh_have.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/bepulapu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/rabuvamidagugejisunu.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_off000069d3.bin
e7d61d8222db2e3d7e1f7a09db98e27ed7874b0a2c1b95d2b5846fa9e6c0a744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D3 5608 bytes
font_01_sfnt_off00007cef.bin
efb314473d8c0c42761a3d0fe5b81b3b282b22fc8c977f9746f9cfe18f4be0e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEF 10128 bytes

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