Malicious PDF — malware analysis report

Static analysis result for SHA-256 786d37c350f889a8…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 07:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49beeaefe9800bad012d7c7e90996902 SHA-1: 22694013ef3a2290894213794c037c4c9c98a2d5 SHA-256: 786d37c350f889a85a7c1c1f755326442948cfc0cb1c2e142d33224061194b02
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one critical link identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key' for 'oxidation reduction reactions', likely a lure to encourage clicks. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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/wix?keyword=oxidation+reduction+reactions+answer+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b0b521_3b74be5591944da49f9a762530cea720.pdf
    • https://static.usrfiles.com/ugd/0a593f_07f08fcfb2b349ae94ea3105e7f80e22.pdf
    • https://static.usrfiles.com/ugd/89c6ad_fff931021e224ee096bd332184d26cf2.pdf
    • https://static.usrfiles.com/ugd/b7ed05_399bbee0e938485da73939ddcd4e7fdc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d848dcfe411946d194bb6a3471ffe9de.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_be8cf217a99640c5b0cbc46c9417cf70.pdf
    • https://static.usrfiles.com/ugd/e8506d_07411835d2134a83a327be76ff3a6a8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2baf3123d5914fa188f56659c9d14a21.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf74f1ab28294179afd852799f9906ea.pdf
    • https://static.usrfiles.com/ugd/bfbc46_3b0420763d254cf589407d8a978671e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf5208196d7941bab4c767336e1eadb9.pdf
    • https://static.usrfiles.com/ugd/b8c837_bec8430e06fd4bc1a8199ad3303ab3a3.pdf
    • https://cdn.shopify.com/s/files/1/0444/4474/5894/files/fakitutuvokekesajada.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/fevexupemi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0893/3540/files/windows_xp_bootable_iso.pdf
    • https://cdn.shopify.com/s/files/1/0431/3120/7837/files/vakeborosaxekixexetoja.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/89193378900.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066b6.bin
b22688f57fc699ad92f9533816f2f55fad2fbb06cf0e2abf9c24fcddf154b24f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B6 5136 bytes
font_01_sfnt_off00007858.bin
26e9e218687f46ad281c4ee37239e9524b7d01559599f1cb0393f1caa11756d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7858 13204 bytes
font_02_sfnt_off0000a20e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA20E 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.