Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40aa6588ccf3085…

MALICIOUS

PDF

49.3 KB Created: 2020-08-31 02:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0febf44d8547e945a3da1bb701f20dad SHA-1: a0e5ae47ca0703c024f053d35a23a832a8bda6ea SHA-256: b40aa6588ccf30853c820040ba741cdb11899685bec4d03c51879f202c736f2c
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The primary malicious URL identified is https://ttraff.com/wix?keyword=efecto+venturi+pdf, which is likely used to redirect users to further malicious content. The document body contains obfuscated text and numerous links, supporting the finding of a link farm.

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=efecto+venturi+pdf
    • https://static.usrfiles.com/ugd/b3bc21_96cfc0a1325347b09ad99d9ef9c1de4f.pdf
    • https://static.usrfiles.com/ugd/19ce5d_dd83d5e3f2d04aeea3b3d672461cae8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e93bba4aaf294c8580a8d5815231a183.pdf
    • https://static.usrfiles.com/ugd/760101_a9783220b29147bf86d8381e25839c5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d236237e451a425fbad8ccf964879a07.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0168/files/fewapetuvuvovupin.pdf
    • https://static.usrfiles.com/ugd/20d83a_f51b0282f991464b8404ad2a5758fe3a.pdf
    • https://static.usrfiles.com/ugd/ddb60a_b6bb347767664be2bafae883251c368b.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_cca90c92374e43eca6ca45c694b1ae51.pdf
    • https://static.usrfiles.com/ugd/b8c837_63fb32eb5a39498183efb7eba3383b7b.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/14819801912.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4946/files/telecharger_la_boite_a_merveille_en_arabe.pdf
    • https://cdn.shopify.com/s/files/1/0445/3485/7892/files/cacfp_food_program_enrollment_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/34014981190.pdf
    • https://cdn.shopify.com/s/files/1/0433/9623/5415/files/physics_formulas_sheet.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_off00006cd4.bin
47b29f5f12a57d154543cba857c7908909b445db281b1ba79f26de6cbb3ade65
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD4 4748 bytes
font_01_sfnt_off00007d0f.bin
d7e339fed37fa84db26fd5c6dc9e923b6e103a366d7a6ab91e5af9f1d3a1a7a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0F 11768 bytes
font_02_sfnt_off0000a395.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74
pdf-font-stream PDF embedded font (sfnt) at offset 0xA395 16060 bytes