Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ec49fa4d180f27…

MALICIOUS

PDF

46.0 KB Created: 2020-08-30 22:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88af701ab70fb46a7fceed5e946c6616 SHA-1: d6434f877ae44a33c897fb352b0650568ff7905e SHA-256: 33ec49fa4d180f27ecd25bc8852380fce8499e9c1af2d5791f2e49b557f70fa8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though partially garbled, includes the URL and a title suggesting a lure. The presence of numerous external links, many pointing to benign PDFs, suggests a link farm used to obscure the malicious destination.

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.cc/wix?keyword=o+tesouro+ca%25C3%25A7a+localiza%25C3%25A7%25C3%25B5es+em+gta+5
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/91e123_3d82c0387fbb4268a4961616948ce5cb.pdf
    • https://static.usrfiles.com/ugd/a1fb72_a41a27c0bbf34447b287e53b589cbbfc.pdf
    • https://static.usrfiles.com/ugd/ca32a8_2a5de8ddca9d4af69c8e0745899eb442.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/39090302412.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/rixumusitedewixo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/java_programming_lab_viva_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0950/6471/files/nokasugenazitifezateb.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/killeen_daily_herald_obituaries.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a55b82ce3a84c6fac59833af00e8dda.pdf
    • https://static.usrfiles.com/ugd/82e28d_7a57df2f60c844f094ce0acba80332fd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006249.bin
990e801f75368cf0fcfcd5e9edc731ae8ce3f237562566893c0f21da096f55de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6249 5496 bytes
font_01_sfnt_off00007482.bin
3993edb155a28e5e28b2dfffac9b127869063ed5fc97c8db68920d5ecd551777
pdf-font-stream PDF embedded font (sfnt) at offset 0x7482 12512 bytes
font_02_sfnt_off00009b37.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B37 4324 bytes