Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d91ddcc5ef590c…

MALICIOUS

PDF

43.0 KB Created: 2020-08-19 18:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de41afd63c3b58ce37991be59a17c27a SHA-1: bc7ea992db0a835fb2fdd729b3348f4ea625be40 SHA-256: 64d91ddcc5ef590c1806bd72e966df41383329a0453e0e8a4f8350fb56651be7
154 Risk Score

Malware Insights

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

This PDF file contains numerous links, including one pointing to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, contains text suggesting a lure related to educational materials, specifically "differential calculus pdf ncert". The presence of a malicious redirector indicates an attempt to lead the user to a harmful site, likely for further exploitation or credential harvesting.

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.com/pify?keyword=differential+calculus+pdf+ncert
    • http://bujusu.altapacificmortgages.com/uploads/1/3/1/8/131857144/2689626daf37.pdf
    • http://files.1nelson.ca/uploads/1/3/1/0/131070207/6957002.pdf
    • http://files.brandonroberteck.com/uploads/1/3/1/8/131856917/8d3d29532243c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1612/5590/files/vevirusonabovubud.pdf
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/manexerixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/dictionary_in_swift.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0431/1905/0908/files/14339356382.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/pais_ausentes_filhos_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lezoxaxus.pdf
    • https://cdn.shopify.com/s/files/1/0438/4188/0224/files/60436072038.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8875/files/economia_capitalista_e_socialista.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/79101952608.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_off00006231.bin
ac5d63ce10cffe34dc7db16059c01905ca6a1b2ac8872b04af0001573abc85a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 5148 bytes
font_01_sfnt_off000073c3.bin
5106cf9f72a643625f9cdd50b220d9b2da584f2e8ae5288f1f084229a7eb6cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C3 13684 bytes