Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a634165dd854e79…

MALICIOUS

PDF

45.6 KB Created: 2020-09-06 15:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44736592d52a30ef5a60deb1ca6a0dc7 SHA-1: f1f9f501d70cb0c4f9cd38578577ec89de28b2f3 SHA-256: 5a634165dd854e7928637112d22cb39869cd9fae3b56515b2b9613d5434017cb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL. The presence of a large number of external links suggests a link farm or SEO manipulation tactic. No scripts were extracted, but the PDF structure and embedded links are sufficient to indicate a malicious redirection attempt.

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.link/pify?keyword=docker+alpine+apk+permission+denied
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/valores_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0438/0504/8989/files/xavigigukaroke.pdf
    • https://cdn.shopify.com/s/files/1/0434/5610/2565/files/41668546396.pdf
    • https://cdn.shopify.com/s/files/1/0428/4012/9692/files/tomigotapidatiwipuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3634/2434/files/88924226555.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/bizozoxonelofixew.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/5485845868.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/31516175542.pdf
    • https://static.usrfiles.com/ugd/e23fbb_f94feac0aac04e6fa3012149571e63f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0bac334638874eb7886b943bbae14768.pdf
    • https://static.usrfiles.com/ugd/e3834b_3440dcc100114b4cbfc5863b52adb770.pdf
    • https://static.usrfiles.com/ugd/c8d394_ed759788fbca42159e4e7740c0c1e0aa.pdf
    • https://static.usrfiles.com/ugd/0f5b72_f4d5ec9570164a17924955a3056ea1a8.pdf
    • https://static.usrfiles.com/ugd/b7082a_8f672b89bfb040ea87f6ce9bf6a5be6e.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_off00006c19.bin
0fa1f524de0fe5b809952ee6c64930fa63199eb93dafdbb639af9b101cfddea7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C19 5280 bytes
font_01_sfnt_off00007e00.bin
d4cdcaaa13aa655d7c76849f2c65b04198a047515faefd488e71a2d988857c3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E00 13604 bytes