Malicious PDF — malware analysis report

Static analysis result for SHA-256 1560a34ba94b594b…

MALICIOUS

PDF

40.4 KB Created: 2020-08-08 18:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52123b95d58255eca48cf0970dc373f0 SHA-1: 855f4a8c938ffa769f78115d562a8f541a050ce9 SHA-256: 1560a34ba94b594bda63fdfcc70b5171537b89454b5ff012adb65a1c2de080bc
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a redirector infrastructure known for malicious activity. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful external sites, likely for further exploitation or phishing.

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=syntactic+analysis+of+sentences+exercises+pdf
    • http://files.jewelconsulting.net/uploads/1/3/0/8/130815009/f9f27c8b0d.pdf
    • http://files.livingwaterscooperative.org/uploads/1/3/1/4/131453698/zutizotoz_tulova.pdf
    • http://files.californiafamilyinstitute.org/uploads/1/3/1/6/131606118/sixivivujugiw.pdf
    • http://files.leaderscalltoadventure.com/uploads/1/3/0/7/130739032/xiwotabukova.pdf
    • http://files.irwinquagmirewart.com/uploads/1/3/1/6/131606874/c8e7ae790.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/22181227407.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/67007145242.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8067/files/remington_1100_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/dosisarukak.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/alesis_performance_pad_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2104/0792/files/94263539131.pdf
    • https://cdn.shopify.com/s/files/1/0437/6920/0791/files/17453878553.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/45582547969.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/gapimutepu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/xatafoxotug.pdf
    • https://cdn.shopify.com/s/files/1/0431/5634/0890/files/16019715857.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/23271270423.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_off00005ff3.bin
da28eb01b7d789f4fbd80d97a319e0452d5123653dde4765bfb9a67ab3926ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF3 5424 bytes
font_01_sfnt_off00007285.bin
bb1b72c65bb5df4424dedf8e74808e6a51444c7623bd014adc203bcd558641d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7285 9988 bytes

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