Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e25b1a726d5b5a6…

MALICIOUS

PDF

43.5 KB Created: 2020-08-19 05:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e76f7c6106a760e71f6fa836a0f1a32c SHA-1: 081462030f87791ce8d78275ec57fe749d903840 SHA-256: 1e25b1a726d5b5a65246c9e095337435db2fa4f7c8ce412e4143260086ec7db0
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, ttraff.ru. The document body, though corrupted, appears to be a lure related to educational worksheets. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to malicious infrastructure. The document likely serves to redirect users to a malicious site under the guise of providing educational content.

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/pify?keyword=fact+family+worksheets+for+2nd+grade
    • http://files.leoxiiiseminarie.org/uploads/1/3/1/4/131453598/8539072.pdf
    • http://files.tnrangers.org/uploads/1/3/1/6/131636712/1766852.pdf
    • http://files.communityecologylab.com/uploads/1/3/1/4/131453574/rolep.pdf
    • http://files.grignonmansion.org/uploads/1/3/0/7/130740524/kokifomudisurajeta.pdf
    • http://files.strideaheadcoaching.com/uploads/1/3/1/8/131871871/6408720.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/jaxaxubasasejafufigin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/benoxugidoxetive.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/xuvuzowusafamir.pdf
    • https://cdn.shopify.com/s/files/1/0440/7505/7302/files/bstc_exam_2020_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/lipazipumomopipegutumilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4402/0125/files/cambridge_igcse_additional_mathematics_coursebook.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9576/files/38905190750.pdf
    • https://cdn.shopify.com/s/files/1/0428/7863/2095/files/gorakurizebimawemomud.pdf
    • https://cdn.shopify.com/s/files/1/0430/5960/9753/files/character_profile_worksheet_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2063/files/a2_english_test_with_answers.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_off00005cd5.bin
3fc7e4f321208114c08f980b8273d170dae792a4b837d7f10dc28ab54ea832d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD5 5568 bytes
font_01_sfnt_off00006fba.bin
67ed4fc0d9f1b06144e43c613e606b3df5eea4a6e074483b7537958b82e5d8bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBA 10348 bytes
font_02_sfnt_off0000933b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x933B 4324 bytes

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