Malicious PDF — malware analysis report

Static analysis result for SHA-256 13753884875de8f0…

MALICIOUS

PDF

45.9 KB Created: 2020-08-31 02:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99e5a8b2a879422ddc8605c54e731056 SHA-1: 37309f86549f2a87cc903bec012b97acf9cef711 SHA-256: 13753884875de8f039ef718ce6c09b001338b4abcad943f8f8724b309af4a61b
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. This suggests a phishing or SEO poisoning attack aimed at redirecting users to malicious sites.

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=top+10+bollywood+music++websites
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/0c41e7_294c223bb59a4bb49200ebde16a9bf74.pdf
    • https://static.usrfiles.com/ugd/599f1c_940f72f7c9414aafa3edf0a356d1fdc4.pdf
    • https://static.usrfiles.com/ugd/db93e9_74128816533c4a6cbb3c3904a89ff7c7.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/gamuwisitazupujidepex.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/41353509319.pdf
    • https://static.usrfiles.com/ugd/b8c837_37699ed67b604364ac23f41f386d8115.pdf
    • https://static.usrfiles.com/ugd/a48928_391ba9065dbb4acb9b3bb2d6c67446c3.pdf
    • https://static.usrfiles.com/ugd/a467d2_450f61281aaa44699fc9a9791b87036c.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_1fa66af223064b1cbbbd7380ff68f95e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d2c8329fb094d4db01d7011dc740726.pdf
    • https://static.usrfiles.com/ugd/69b86f_2b0b39f4183b4e8996c639a32314f021.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_off00006742.bin
07c778b349a3b34d074ef06082aa91d03765cbaa1bba92f6d51a9d09e3af42fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6742 5164 bytes
font_01_sfnt_off000078f0.bin
18ac2c5dcac1d341a97a46bfcf1ac3ba16620f8c9e51bf303bc861dc45620078
pdf-font-stream PDF embedded font (sfnt) at offset 0x78F0 10492 bytes
font_02_sfnt_off00009cbb.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBB 4324 bytes