Malicious PDF — malware analysis report

Static analysis result for SHA-256 db19983da3186cc9…

MALICIOUS

PDF

97.6 KB Created: 2020-08-14 05:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efb52b91d27fb0cb63519098c8c7a0af SHA-1: e1d4e6685ce72c92f6969996ca935045b03f127e SHA-256: db19983da3186cc98fca7d79809d65f544b53cf792d32a867c665812bd19da49
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=captain+america+the+first+avenger+hub'. This indicates a phishing or scam attempt. The document also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier also 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.com/pify?keyword=captain+america+the+first+avenger+hub
    • http://files.johnirwinsonlinebusiness.com/uploads/1/3/1/4/131437669/0215b4285.pdf
    • http://files.sarasautismsite.com/uploads/1/3/1/4/131483275/zijezubidixejejawevo.pdf
    • http://pegax.stgilesdesborough.org/uploads/1/3/0/7/130738902/671190730b.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2504/files/video_de_reggaeton_2015.pdf
    • https://cdn.shopify.com/s/files/1/0433/8414/4037/files/automated_and_electric_vehicles_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/campbell_biology_10th_edition_test_bank.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/20087571459.pdf
    • https://cdn.shopify.com/s/files/1/0437/4000/4501/files/fezitokujakubezodarejudig.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/57839290038.pdf
    • https://cdn.shopify.com/s/files/1/0433/9862/7495/files/xipawopob.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/mekofizodubosewalupeban.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/81357805246.pdf
    • https://cdn.shopify.com/s/files/1/0430/7546/9473/files/ratipuzujonozezijuzev.pdf
    • https://cdn.shopify.com/s/files/1/0429/0671/4268/files/generic_min_heap_implementation_in_java.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141b3.bin
9c038403d0359bde31be72b217e2cfad840d769584aaba51216ea7a41e2de69f
pdf-font-stream PDF embedded font (sfnt) at offset 0x141B3 5504 bytes
font_01_sfnt_off00015442.bin
438adf29438587dcf93e4e9a6d247bd83cef86229793bda04bb458a116030831
pdf-font-stream PDF embedded font (sfnt) at offset 0x15442 10772 bytes