Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8024a1d22dd6528…

MALICIOUS

PDF

48.2 KB Created: 2020-08-30 18:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25cf33d24d75825713c2ad43b5323fc7 SHA-1: c02c2cf85d10c6300a109f6f2d7d7f1450048c99 SHA-256: f8024a1d22dd65284dbd6d0e2a72bc0a8f00170fccfdcf714cde49cff2b5d112
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, including one to a known malicious redirector at 'https://ttraff.cc/wix?keyword=dividing+fractions+printable+worksheets'. The document body, though heavily obfuscated, appears to contain text related to educational worksheets, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to redirect users to potentially harmful sites.

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.cc/wix?keyword=dividing+fractions+printable+worksheets
    • https://cdn.shopify.com/s/files/1/0434/1265/2194/files/98818253329.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/wutule.pdf
    • https://cdn.shopify.com/s/files/1/0434/2045/0972/files/51412627945.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/18171128840.pdf
    • https://cdn.shopify.com/s/files/1/0462/9309/0464/files/flocabulary_transitions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/latafona.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8744/files/kevudagadixogu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8136/files/bose_quietcomfort_35_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/network_attached_storage.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d96980ea4e847a6a7880b82de79ca64.pdf
    • https://static.usrfiles.com/ugd/b8c837_bad4b69883224d7d8273a374c929be27.pdf
    • https://static.usrfiles.com/ugd/760101_7c05530e1d53451eabb338a7a5e36668.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/75181287597.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0358/files/powakimowixukamuwuw.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_off000069ee.bin
0fa36d72569c8cebe729dd725d932a10f14a7cd38fced6f5091a036f59ba9478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EE 5560 bytes
font_01_sfnt_off00007ce2.bin
5ee852afbb2c287d2340a86fc68dafb387f825944d75bf61c98a88ee3c98f62b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE2 12096 bytes
font_02_sfnt_off0000a40e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA40E 4324 bytes

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