Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ffea99464248c8…

MALICIOUS

PDF

45.0 KB Created: 2020-09-01 20:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abe61b105a45263044cd3c1683a65266 SHA-1: 5ff5144d8021853b438946910a6a4f41305373bf SHA-256: 82ffea99464248c8f38668460c0a1795f6a16c31360111bdaa32dcbbbb5ae7c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to SEO-optimized PDF documents hosted on static.usrfiles.com. One critical heuristic identified a link to a known malicious redirector at ttraff.com, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF documents.

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=love+yourself+answer+font
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/98e298_2d6ca6574cd445b49f1884cf4348f727.pdf
    • https://static.usrfiles.com/ugd/87d215_91a8285de95845769640d7ab84cb7e3b.pdf
    • https://static.usrfiles.com/ugd/8acad3_d57c9b097a5f4ad8b686425ac99c6a52.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/92915032545.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7645/files/convertir_archivo_cade_simu_a.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7074/files/public_policy_and_urban_design_management.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc272b27e15f4de58af9a9a24f09f596.pdf
    • https://static.usrfiles.com/ugd/eda9ba_030a4a82f66d4d7d803c15afa7f2523b.pdf
    • https://static.usrfiles.com/ugd/a01749_13269e586bfa4ba8b829e26b2cd497d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c57a39f659d94095ad8bea18dad3c719.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_off000066d5.bin
216345515ccf5daeda9e012c3f92194fe42917cc4c23b3e36895bcc1f290583b
pdf-font-stream PDF embedded font (sfnt) at offset 0x66D5 4792 bytes
font_01_sfnt_off0000774f.bin
008ccb9a48844f2e4a2b8a3732260ca5e9d51065ecdd78512023b4411fc81732
pdf-font-stream PDF embedded font (sfnt) at offset 0x774F 9992 bytes
font_02_sfnt_off00009979.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x9979 4324 bytes