Malicious PDF — malware analysis report

Static analysis result for SHA-256 711f5b629248601c…

MALICIOUS

PDF

46.6 KB Created: 2020-09-18 14:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ead4affa6584c5118f0fdaa09c0086d5 SHA-1: ff5770a240380061671329aae5fa2656a4427c6f SHA-256: 711f5b629248601c2bf974d2a9565bb07aacfb6b6c08b6915d6545c2191f8f1c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious due to a high number of embedded links, many of which point to redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a worksheet answer key. The presence of numerous external links suggests a link farm or SEO poisoning attack, aiming to drive traffic to potentially malicious 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.me/wix?keyword=simple+machines+webquest+worksheet+answer+key+pdf
    • http://files.scc.org/uploads/1/3/0/8/130814830/vikeruwenomezo.pdf
    • http://vuwepu.bond007band.com/uploads/1/3/2/7/132740669/e1f5b.pdf
    • http://files.ebanhelsinki2019.com/uploads/1/3/1/4/131407530/wopusezebaf_pibatodebe_porune.pdf
    • http://xodibarip.honordaypasco.org/uploads/1/3/0/7/130738780/gefunovebibi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e2f8680d-4a82-48e3-8b70-044863183eda.filesusr.com/ugd/4cf28d_954138410cd3404c8e25568225d2546b.pdf?index=true
    • https://94ae51f2-e453-4f03-94cc-9c6a64add50f.filesusr.com/ugd/90d19e_650d5a1d384d4e499ece06ce2f6842a0.pdf?index=true
    • https://2f59e4dc-ca44-40c2-bf93-d710c3bde73e.filesusr.com/ugd/9b7d8a_1c3a5a415dc34b9bb60cd7e601fe1a3a.pdf?index=true
    • https://a4c7aaa5-2229-441c-a4e0-26383a626555.filesusr.com/ugd/d31907_361928b6927c49c5a5a99d76bbbdf0d5.pdf?index=true
    • https://ed851a58-6815-4e84-aa99-0bcb340fb67d.filesusr.com/ugd/cd81e9_6e2b25b84c9a4d3e9bd120664889e2d1.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0485/0824/0027/files/wizard_games_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/xikaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7691/9200/files/basic_vehicle_maintenance_checklist.pdf
    • https://5fe78d26-0577-41f4-abfc-f68bbb62a6fd.filesusr.com/ugd/610d21_af379f94691f403fb4f5c71954bfd851.pdf?index=true
    • https://209ff6d8-2e96-461b-90da-28db2995cf20.filesusr.com/ugd/74e905_f84ac2b9233b42668a9b0fc4e44d1563.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075cf.bin
aa5f50cfd6b12594558b35107d6e0a73a1aaf6421857921f802eb89d866d51fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CF 6020 bytes
font_01_sfnt_off00008a30.bin
174d7f503d1bbdd5d03c974514362584ad180cd88ef0b8949893f77cb728fe30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A30 10188 bytes

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