Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4883010d68e3ed…

MALICIOUS

PDF

38.4 KB Created: 2020-09-01 08:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31c4a03b231ac08766c8b93cf253f5e4 SHA-1: 28aa83b7dc262f67413795131b9ce4dd609720ac SHA-256: ed4883010d68e3ed9dcced76aa1664f1ffa745efe8c968fb735138ee3237b38f
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/wix?keyword=android+9.+0+samsung+c%25C3%25B3+g%25C3%25AC+m%25E1%25BB%259Bi. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on cdn.shopify.com, suggesting a coordinated effort to drive traffic to malicious sites through SEO manipulation or phishing lures.

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.ru/wix?keyword=android+9.+0+samsung+c%25C3%25B3+g%25C3%25AC+m%25E1%25BB%259Bi
    • https://cdn.shopify.com/s/files/1/0429/2237/7375/files/il_classicismo_musicale_scuola_media.pdf
    • https://cdn.shopify.com/s/files/1/0432/2017/2957/files/pelenibuvufemejasapinu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0586/0248/files/the_tempest_with_translation.pdf
    • https://cdn.shopify.com/s/files/1/0435/1534/7103/files/59226450292.pdf
    • https://static.usrfiles.com/ugd/6da380_52572ae3cf8747b085ec78ccef174cd7.pdf
    • https://static.usrfiles.com/ugd/99a8f2_0ad5d42be01446cf9c3c02de87687947.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nejoxalivivurotuzepebibus.pdf
    • https://cdn.shopify.com/s/files/1/0464/7963/8680/files/alayamlo_pravesinchandi_song_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0436/2518/5442/files/20694581944.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_off000054ed.bin
fe552029b696fc5fa17b45ab5c6790d5f39607e8f7807280ad0b1ff2ce3782f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54ED 5900 bytes
font_01_sfnt_off0000689f.bin
c39c4965f09d25914089706d4ca1e522f2bcce8fb3e2ef75b9eb2de57d92a24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689F 10216 bytes

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