Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c8813e04d8a417…

MALICIOUS

PDF

44.9 KB Created: 2020-07-27 16:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c983abb9e5da7a1d98fda0e02e5e5bd SHA-1: 544dbccba955e0d221c82052be7bdd2516976351 SHA-256: 67c8813e04d8a417df20b0214a728255dfba898893c4fadf85f950ec682e533d
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector (ttraff.ru) and others pointing to PDF files hosted on various domains. The document body, though heavily obfuscated, suggests a lure related to 'adverbs worksheets for 6th grade'. The presence of multiple external PDF links, many with numeric or random-looking slugs, indicates a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=adverbs+worksheets+for+6th+grade
    • http://files.blue-river-vermont.com/uploads/1/3/2/7/132712116/513f61d10de22.pdf
    • http://files.ihotispolis.com/uploads/1/3/1/6/131637309/1099949.pdf
    • http://files.truckelele.com/uploads/1/3/1/4/131438312/suvepe.pdf
    • http://files.creativenationnonprofitcorporation.com/uploads/1/3/0/7/130740242/4552228.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/degejuwetisagemudow.pdf
    • https://cdn.shopify.com/s/files/1/0432/1089/9624/files/fikifesiwukedusuravu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6327/9767/files/familojufujuwibopunixima.pdf
    • https://cdn.shopify.com/s/files/1/0432/3409/9362/files/15425068981.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/ruwose.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/roderofofefexumu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/48818492621.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/2134835119.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/34305844583.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/fobiwasurow.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/81545262520.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/guxidasuxirivipufazafowu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/67906473415.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_off00007204.bin
92df98ccd183bbde750b67545697616b0b6f8c937486cff7f32c64371929366c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7204 5272 bytes
font_01_sfnt_off00008413.bin
f4eb353e3e4e32e33f6a1593e33e4cf9a61b2d2d9f6dab718b4484de389444c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8413 10072 bytes

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