Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3932458f2ab0e65…

MALICIOUS

PDF

35.2 KB Created: 2020-08-30 14:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e568e7c567ccad86b87c6441cfb7b8bd SHA-1: afe561b6e18050a6af853f132f3c9485e945829d SHA-256: a3932458f2ab0e651ae2fd092a626fb0f5a41fb3b62e7a76f747ca3b61cf28ce
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL identified. The document body, though heavily obfuscated, contains the same malicious URL, suggesting it's intended to lure the user into clicking it. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link-based attack.

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=manual+de+cisco+packet+tracer+7.0+en+espa%25C3%25B1ol+pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/29401426248.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/10202877606.pdf
    • https://cdn.shopify.com/s/files/1/0439/5322/5883/files/zitebifaduponubugejo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2183/6193/files/canadian_citizenship_application_minor.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c4124c12b6e44ecb468ccb43e47b410.pdf
    • https://static.usrfiles.com/ugd/f0e51d_61858fc064874a648ca231b2943a8aec.pdf
    • https://static.usrfiles.com/ugd/b8c837_e28ad10048174f96ad44a077dbc55c73.pdf
    • https://static.usrfiles.com/ugd/b8c837_15861b91b164477fb0af47f3fd67a988.pdf
    • https://static.usrfiles.com/ugd/353d00_536562b3e16b45638f4d8b14afe48a58.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b14eb682f704021adc5dfbf9910e8c5.pdf
    • https://static.usrfiles.com/ugd/cc089a_661e93d83c0f4bbfb2fb7989ef2f0df7.pdf
    • https://static.usrfiles.com/ugd/7f16bd_bb20389e8da34f179edbe317329a31bc.pdf
    • https://static.usrfiles.com/ugd/136d07_f69897c43fd044f18e0d3b6c991d363e.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_72406d2923ad445b87029daa3b1672ba.pdf
    • https://static.usrfiles.com/ugd/493135_b7fad46871904fdeb8598701758ecc5b.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_off00004813.bin
10337b8cb99f794322fa4225df1bac5a5e4fcb0f2f50883dde06103c79fc0149
pdf-font-stream PDF embedded font (sfnt) at offset 0x4813 5684 bytes
font_01_sfnt_off00005b3f.bin
eb8927fdebe4cef404b64ebdce8152f6322351fa79b3e1be5483fda5d73e7a9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3F 10052 bytes