Malicious PDF — malware analysis report

Static analysis result for SHA-256 84521ce8390f22b3…

MALICIOUS

PDF

51.8 KB Created: 2020-08-31 03:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e1cfd1f073a023c920ffab8f4cc7d75 SHA-1: ed895e0c096b1adb523ae93ddeca93b4c6add309 SHA-256: 84521ce8390f22b31c2b82eef0840614be6afb190727eea85b48343a01c93aed
154 Risk Score

Malware Insights

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

This PDF document contains a link to a known malicious redirector, ttraff.club, which is likely used to funnel victims to further malicious content. The document also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which are benign, but the primary malicious link is clearly identified. The ML classifier strongly indicates maliciousness, and the embedded URL is the primary vector for attack.

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.club/wix?keyword=vehicles+in+7+days+to+die
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_1f7deda28ff6422481ffdd6e65b38894.pdf
    • https://static.usrfiles.com/ugd/b8c837_52420dc35d35428d9fabd42195870765.pdf
    • https://static.usrfiles.com/ugd/b8c837_5844bef1d722463685ebc3e8c95d2e04.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0711/files/56440420198.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/ielts_speaking_vocabulary_band_8.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/astrology_and_astronomy.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a820ffac58e45f9ad55be805a49107a.pdf
    • https://static.usrfiles.com/ugd/ee4a13_e7e16cd40c4149eda8cd22f6cad9864e.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4018/files/vufezefivolifo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9213/0458/files/pajufedapada.pdf
    • https://cdn.shopify.com/s/files/1/0432/8957/5588/files/mepagalukibupive.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/rebubedovezemipawodu.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_off000085af.bin
15920b21309860aa7491a38148897c41d73eb1461e2326f4279d2bf3719beebb
pdf-font-stream PDF embedded font (sfnt) at offset 0x85AF 5080 bytes
font_01_sfnt_off000096f7.bin
1008022971614c101a32f7ed92a469abc880841600757c2822b99315570b1b49
pdf-font-stream PDF embedded font (sfnt) at offset 0x96F7 13764 bytes