Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8055c7ef798897e…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 03:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14ad323dbe76330a8ec707151b32ddaa SHA-1: 3bc40a12764a8ec4ba2db772fdb122d0abe78873 SHA-256: c8055c7ef798897e448773e49afa435bebe1081cded9f725fd79cd1390835afb
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which is likely the primary mechanism for delivering a malicious payload or leading users to a phishing site. The presence of numerous embedded links, many pointing to external PDFs, suggests a broad distribution or SEO-based lure strategy.

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.link/wix?keyword=www+dpw+dc+gov
    • https://cdn.shopify.com/s/files/1/0440/0388/5206/files/best_asvab_study_guide_for_air_force.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2892/files/67060025912.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9378/files/punctuation_worksheets_for_grade_7_with_answers.pdf
    • https://static.usrfiles.com/ugd/b8c837_75af4c98b558483ab5b7d42cc283ab75.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce9be25263ae42d2b74b1bbd6293a363.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_a6aa141a49864798852128eeb977c8cf.pdf
    • https://static.usrfiles.com/ugd/b65acf_0404ff8e2d1842e892a30a60e81d6889.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6454569ec054182aca7b573c3613ff6.pdf
    • https://static.usrfiles.com/ugd/52b593_572dba166fef4f7baeaaec1d87a03b20.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92c904487cc4e9981450bb482de60a9.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/54159907671.pdf
    • https://cdn.shopify.com/s/files/1/0466/8702/7364/files/99456279271.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c73.bin
9ee1c10b0828a8e9cbd8efdf8ed09a1d22591b686741b1aaadc64fb4c6a2380a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C73 4328 bytes
font_01_sfnt_off00006b38.bin
3abb66d3ef256680446521ca3adc0d71e7c07694c3b234eca8a77a3f8869258d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B38 9852 bytes
font_02_sfnt_off00008cf3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF3 4324 bytes