Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b345f3196ffca0e…

MALICIOUS

PDF

47.5 KB Created: 2020-08-31 05:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5c84ed68195ce563be299f46f75e5cb SHA-1: 150a77e0db13e1aca145da1c1d1a254c4f8056ac SHA-256: 4b345f3196ffca0e3914f5f69607126d0014912d884ada8dbe0695873b33f187
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. This suggests the document is designed to lure users to malicious sites, likely for phishing or malware delivery. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is a high-confidence indicator.

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.com/wix?keyword=rainbow+six+siege+all+charms
    • https://cdn.shopify.com/s/files/1/0434/2585/7703/files/kiadb_bye_laws.pdf
    • https://cdn.shopify.com/s/files/1/0439/8556/7902/files/easy_english_learning_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/single_variable_calculus_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4976/files/29116729578.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c48052946144b0ab0da24408f636f6e.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_6cc7e6dfbc2441b78540b3d11a56f621.pdf
    • https://cdn.shopify.com/s/files/1/0436/9206/4933/files/strengthsfinder_2._0_access_code_crack.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/pasoxuwizurenov.pdf
    • https://cdn.shopify.com/s/files/1/0461/3498/4857/files/zelun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/bozukesidurox.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/rpg_maker_mv_character_generator_add.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6680/files/gefevarika.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_off00007b3c.bin
6daddb8d2094448ffd10a645f18f28f1f5df782237365654ef835249a08f1c46
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3C 5520 bytes
font_01_sfnt_off00008df0.bin
7ee39c82f9f9875aff297167a645fb589e4e82e505c868128aaf0c5a02466c39
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF0 10412 bytes