Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5dac4fa39bb636…

MALICIOUS

PDF

38.0 KB Created: 2020-08-31 08:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5913998a916f501f1190d31a9eb5ca1b SHA-1: d9d0b6843f95954dee7304c7ccf4bf8d6aa84aaa SHA-256: 5d5dac4fa39bb636aea70b34b1f80979b17136da710fde2e571ff32a4635bf79
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/wix?keyword=screaming+bird+meme+template. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector strongly suggest an attempt to lead the user to harmful content, likely as part of a phishing or scam campaign.

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=screaming+bird+meme+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_07236b7a38be4270b572865f87ad0d89.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4e7399ef10f49729aac82d6bcbcfe2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8901d2675ded4b4db21fc507091c7d55.pdf
    • https://static.usrfiles.com/ugd/6f53d7_23a0c7a603cd47c9ae4a9badc1d391ba.pdf
    • https://static.usrfiles.com/ugd/18f527_ce1d4eddcf7649ad9ee1fbb6bbacc6d0.pdf
    • https://cdn.shopify.com/s/files/1/0440/5847/6694/files/teen_wolf_songs.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/lake_del_valle_fishing_report_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4757/files/30738339815.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0165/files/21747166802.pdf
    • https://static.usrfiles.com/ugd/b8c837_375c03069b3d4bc0bc11542149eb8ceb.pdf
    • https://static.usrfiles.com/ugd/73c254_d96a939f09ab4016ae3d78b8381b94a0.pdf
    • https://static.usrfiles.com/ugd/c3548c_edbf0b945f36445099faff62e891212e.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7207/files/birthday_card_design_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4458/files/66859101164.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9769/files/guluti.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_off000048e9.bin
c871259347760856b743b47a11c1eb6e4656612ae0933d66a2dd43c9870703da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E9 5136 bytes
font_01_sfnt_off00005a2c.bin
c80af499a72b60d19b45226112b9da359ac516c96dc8d4a9aed5c7b490de50f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2C 10228 bytes
font_02_sfnt_off00007d27.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D27 4324 bytes

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