Malicious PDF — malware analysis report

Static analysis result for SHA-256 874b59d948114950…

MALICIOUS

PDF

33.2 KB Created: 2020-08-31 14:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 734a32600d5a400cc2ee33a0403b1f57 SHA-1: fea00c3a1d0b1f38ee9b3de3db47aa85d49ead45 SHA-256: 874b59d948114950917979c388921a9cfcbe07b37b19e4455a41fde9d91f67c2
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 host other PDFs. One prominent link, 'https://ttraff.ru/wix?keyword=apkpure+clash+royale+mod+apk', is identified as a malicious redirector. This suggests the document is part of a campaign to drive traffic to malicious sites, likely for phishing or malware distribution, under the guise of providing game mods.

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=apkpure+clash+royale+mod+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f09a9d_0ae2f91697764384bb5388d81fe69ebf.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_9fb3de6f6d5e4245a21756e6e47cba18.pdf
    • https://static.usrfiles.com/ugd/b8c837_36015bfecebd4de887802a544476f7cb.pdf
    • https://static.usrfiles.com/ugd/5ed537_66ca7c24e2a54124bc26cbd982b32e1c.pdf
    • https://static.usrfiles.com/ugd/b8c837_179928909eac40b2b6fdd4043b1e727b.pdf
    • https://static.usrfiles.com/ugd/fd3290_ecf5b74b74c941409fc757f60a755c22.pdf
    • https://static.usrfiles.com/ugd/b8c837_69864e2194be4bcab8c9cf96bf64d9ec.pdf
    • https://cdn.shopify.com/s/files/1/0437/6910/2485/files/35278392634.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0465/5421/8646/files/80390862403.pdf
    • https://static.usrfiles.com/ugd/b8c837_10ef68244060448abd7ba5d1a41ddbec.pdf
    • https://static.usrfiles.com/ugd/80bfa9_ae2ca6610b4846ef96b48b95bb958bdb.pdf
    • https://static.usrfiles.com/ugd/d17951_ac19e965d3b342f7a43af9ba65414eeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_570843dfa00848aa8f001642ff081495.pdf
    • https://static.usrfiles.com/ugd/253000_49f59db4fbc14fada9a34cd5966162a2.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_off0000444b.bin
95d42bb7ee3da362ba26af198ef4b5cc8aaaea4741be718d0160de2cc2cb9983
pdf-font-stream PDF embedded font (sfnt) at offset 0x444B 5468 bytes
font_01_sfnt_off000056bd.bin
11e1f10ec25ef526bec300998bd8825cffdffa97ff1ceb7e0b0dae1815cd5ad0
pdf-font-stream PDF embedded font (sfnt) at offset 0x56BD 10172 bytes