Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc3aec5976e17ca…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 05:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dfb74092ba79f711f72c71c0fad3e2f SHA-1: a5db37e5c0a850bab2efa0af1eaa456284f16ba1 SHA-256: bdc3aec5976e17ca6a5f44d9439a5bbb8ef9f24610bd7cba38ff354fe2c0ae60
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=adobe+master+collection+cs5+keygen, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to reference software like 'Adobe master collection cs5 keygen', suggesting a lure for pirated software. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=adobe+master+collection+cs5+keygen
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/charge_sensitivity_of_ballistic_galvanometer_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/janitazatawafik.pdf
    • https://cdn.shopify.com/s/files/1/0429/1746/2182/files/ygdrasil_jorge_baradit.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ac9f9b88e3c48abafbd446574e31abb.pdf
    • https://static.usrfiles.com/ugd/d78803_c5d9678b7e2e496298efdeaaf854deee.pdf
    • https://static.usrfiles.com/ugd/b8c837_8810646556304b8db3d75e64039a340e.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/89826565850.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/51652319922.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/6451611421.pdf
    • https://static.usrfiles.com/ugd/b8c837_47bf84b640f6426cb4871c64fbd75f2b.pdf
    • https://static.usrfiles.com/ugd/ea2f88_52b5df1d34cc4b2f9418e2e68572fdb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_db3c08653dbf460793325522e1576ce8.pdf
    • https://static.usrfiles.com/ugd/857e61_a04e071581b449e18938f18252f1854d.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006225.bin
0c23c610abb0a9f303599274eac1ac3ba2d129c0f086ffbe1c32027d2f900bd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 5680 bytes
font_01_sfnt_off00007569.bin
6188a51d798e73096bd5f4db504fba2bea9c54907e03629fd967f374044834ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x7569 13984 bytes