Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed52529088673d63…

MALICIOUS

PDF

37.9 KB Created: 2020-08-30 03:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1662cd11983e6961a4c2f4b226944c82 SHA-1: 4db251f293ba9f9158b90ff8692da50f8e674b6d SHA-256: ed52529088673d63e013c7688ab1d7e96080cbdaa8c4e9a31b45df8d8d428f71
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=a+wrinkle+in+time+chapter+3+question, which is identified as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many pointing to Shopify-hosted PDFs, likely to manipulate search engine results or distribute further payloads.

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=a+wrinkle+in+time+chapter+3+question
    • https://static.usrfiles.com/ugd/9e53d4_daedd0a7f6d64b44aa89dfeb3a094f97.pdf
    • https://static.usrfiles.com/ugd/b8c837_27498844abce468995630715a08c56a5.pdf
    • https://static.usrfiles.com/ugd/2b3f46_f82d602c7680463996fc661f6f93e0a8.pdf
    • https://static.usrfiles.com/ugd/6116da_682167b5016b494e8fc5c1fd7dc95019.pdf
    • https://cdn.shopify.com/s/files/1/0428/5317/1356/files/besame_mucho_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/2975049257.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/fakikogewu.pdf
    • https://cdn.shopify.com/s/files/1/0460/9703/9524/files/ziwinasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5756/files/usmc_mos_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/kalidagixotexotabitivuge.pdf
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/minobaxizozufirizom.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0306/files/14889843114.pdf
    • https://static.usrfiles.com/ugd/b8c837_754389c3fe49474483e0c5960eceea09.pdf
    • https://static.usrfiles.com/ugd/9dda13_db075291e9474fd7b80fb75fb0d8c36d.pdf
    • https://static.usrfiles.com/ugd/b8c837_65935f0f44a7452cbeb395df8629532b.pdf
    • https://static.usrfiles.com/ugd/834936_b350fffb0b854c71804d8ff9fd0cb835.pdf
    • https://static.usrfiles.com/ugd/b8c837_563c20ddf4b743918a3473b6aaa67e21.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_off0000568a.bin
0c737f734697d60c34f973ce41d7fda8fd660b0a180264468297138db898825b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x568A 5608 bytes
font_01_sfnt_off00006982.bin
46d221a28caa469fb1d7228caf55c2702dba315b495022d15da6e47f8e731c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6982 9736 bytes

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