Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bf285b9e98003a…

MALICIOUS

PDF

41.0 KB Created: 2020-08-24 17:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 978bace787187934770c052cc1ad3989 SHA-1: da0598f0cdd587cb30fb66bf26802e3cf4804a02 SHA-256: 71bf285b9e98003af603cd1ab29ce70c769121e793c1abb6024f6f84f739ec79
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to generate SEO traffic. One prominent link, disguised as a SQL server installer, redirects to `https://ttraff.ru/pify?keyword=sql+server+2016+express+installer`, which is identified as malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The presence of many links suggests a phishing or scam attempt, likely using the links to distribute further malware or lead users to malicious websites.

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=sql+server+2016+express+installer
    • http://zesido.ortreport.com/uploads/1/3/1/8/131871674/dolovedojilujavokeko.pdf
    • http://files.ovmsso.org/uploads/1/3/0/7/130739163/3778170.pdf
    • http://sokadamo.newlightwater.com/uploads/1/3/1/6/131607712/1296822.pdf
    • http://files.southfortyormondbeach.com/uploads/1/3/2/8/132814463/pegasazidev.pdf
    • http://junetiz.goethefruehlingsfest.com/uploads/1/3/1/3/131379730/texevode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/nulunodixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7165/9414/files/luragi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/delokufusixotin.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/61283458413.pdf
    • https://cdn.shopify.com/s/files/1/0435/7318/2625/files/gamur.pdf
    • https://cdn.shopify.com/s/files/1/0450/9813/9813/files/jawufodasekiwinaper.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2346/files/approximate_quantities_method_of_estimating.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3540/files/xuguwogugi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/wigukidiwulufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/gothic_calligraphy_fonts.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/valudoxudasizajib.pdf
    • https://cdn.shopify.com/s/files/1/0431/2632/5402/files/xujewawonexaxikonuziti.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_off00005f4b.bin
1a9f2a9537980fd3958b31f4fc4d6650d45ba81adea864fb10430a62266be223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4B 5652 bytes
font_01_sfnt_off000072a8.bin
01755aa199ba3c2d4935c70f908065480b7a574abb0dc63d78dbdd302c268ad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A8 10628 bytes

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