Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc83d0d9c426c2b…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 11:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fbe9bd18b10b76bfc56055015593a46 SHA-1: 66c89d080da4b07513a031a773c15da7c024e2c4 SHA-256: 5fc83d0d9c426c2bca246ec2342a6b2842e8e8c663c58527ec23f86c7855ae92
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. This suggests the document is designed to lead users to malicious content, likely through a chain of redirects to obscure the final destination. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=jurnal+alley+cropping+pdf
    • http://numaseti.ljhfoc.com/uploads/1/3/1/3/131383791/nowipurusamoje.pdf
    • http://files.aspartika.com/uploads/1/3/1/6/131606289/papakegimax-sivob-vamutibema-zuwila.pdf
    • http://files.geraldsandau-sculpture.com/uploads/1/3/1/4/131410158/e0c4b0350.pdf
    • http://files.youngoakmorgan.com/uploads/1/3/2/6/132683088/4197937.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29025511016.pdf
    • https://cdn.shopify.com/s/files/1/0445/2987/7151/files/fur_elise_ukulele.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/mazilamirazamipurotuvux.pdf
    • https://cdn.shopify.com/s/files/1/0431/5922/4480/files/92969527978.pdf
    • https://cdn.shopify.com/s/files/1/0433/7896/6686/files/didumazelirezekuzafige.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/wimed.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/bash_try_catch.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/wobipuzenagutuwepof.pdf
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/fantastic_voyage_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/zovukis.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/foguzus.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_off0000656e.bin
fbd20cb89857958801cd525479e804cf89450592d4dcb81c9f2b25d5a8346948
pdf-font-stream PDF embedded font (sfnt) at offset 0x656E 5236 bytes
font_01_sfnt_off00007752.bin
5f8e257ba4d7ad402756ed67c0525e34179692490060a5d83d24f5c2a55ce5a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7752 11484 bytes