Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dec343d5871cfbf…

MALICIOUS

PDF

36.3 KB Created: 2020-08-13 09:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f43fc152ccc47ab352a9aaaa6f35112 SHA-1: ce8841e603467d432536a5d64d69c5b0c44b00ba SHA-256: 8dec343d5871cfbf980209859ef05793cf319a82ae678970874e3e453b32e1f4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/wb?keyword=many%20gifts%20grade%204%20textbook%20pdf. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links, suggesting a lure to trick users into clicking malicious links. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or redirection attempt.

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/wb?keyword=many%20gifts%20grade%204%20textbook%20pdf
    • http://files.pressproofcartons.com/uploads/1/3/0/8/130873876/3a8125.pdf
    • http://lodevanex.packupallyourdishes.com/uploads/1/3/1/3/131383657/5430599.pdf
    • http://files.amandaetchison.com/uploads/1/3/0/7/130775310/sujum.pdf
    • http://dinisule.karynpearson.ca/uploads/1/3/0/7/130739561/bc36421bffa16.pdf
    • https://cdn.shopify.com/s/files/1/0428/0749/2775/files/nms_case_files_surgery.pdf
    • https://cdn.shopify.com/s/files/1/0454/7847/7976/files/camus_myth_of_sisyphus.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4283/files/remove_ads_from_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/nacionalismo_mexicano.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1110/files/black_and_decker_20v_trimmer.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/87521516791.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/utorrent_not_connecting_to_peers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83406059157.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/wabigasaruxipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5003/2549/files/41199221907.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/40715234659.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000042f1.bin
c9560ede35ee97d8d9118464253639e3b5c41c163da60ea1c09b1d8404ae7562		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42F1 5432 bytes
font_01_sfnt_off00005585.bin
aabc69335ca1559cf01af764eb229505ff8239762d7570ef5212d8c803861808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5585 9612 bytes
font_02_sfnt_off00007661.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7661 4324 bytes

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