Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec2dbba24467893…

MALICIOUS

PDF

35.5 KB Created: 2020-09-19 19:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d586a56499e2f8671d6b7d40b0b9ff99 SHA-1: 5721e438e2bc40a86309ef32178031527529fcee SHA-256: 5ec2dbba244678937f5b30d2c5cce84f8acead6dd2f77af0bc4827825b3bc54b
154 Risk Score

Malware Insights

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

The PDF contains embedded links and a URL within its body text, masquerading as a worksheet. The primary malicious URL, 'https://ttraff.club/wix?keyword=mole+mass+calculations+worksheet+answers', is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous other PDF links, suggesting a broader campaign to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

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.club/wix?keyword=mole+mass+calculations+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7e96205c-0c7c-4759-8183-97929c87822c.filesusr.com/ugd/5f226b_de45f44dc0854c01911efe387aeb9ca0.pdf?index=true
    • https://91380323-69af-44f2-9dc7-ec259c8fc684.filesusr.com/ugd/3d0627_612eed17148146fb9080501b70c81c69.pdf?index=true
    • https://634ad8de-b36e-4fc7-84a2-ad9938d14808.filesusr.com/ugd/db1da1_db128d5037df436f97edeb5bfbc6044e.pdf?index=true
    • https://5963c288-2110-4cd7-a1ff-1737fec32d22.filesusr.com/ugd/4733ca_6e11bc67ca6f46e2939f03b92d8a3ddc.pdf?index=true
    • https://ae8e5f00-e239-40cd-a832-e193cb4f0b88.filesusr.com/ugd/b14caa_f8cd2b94cdd74e9f8fb2c967ce481bd0.pdf?index=true
    • https://24ff4a37-a7ea-4be1-ba1f-e4132a133ca6.filesusr.com/ugd/d61b30_c8d547319e434cb3a1c005c5c27630dc.pdf?index=true
    • https://aff10b6b-16df-4dfe-bae0-2cd4691a4d63.filesusr.com/ugd/dc6899_67e32172ccd44d89b15e19f2bca08079.pdf?index=true
    • https://9fed244c-489b-418f-9303-3063d2c60d9d.filesusr.com/ugd/35e1ce_b3cc2296b55b4f6c9eb8b52ccd16da09.pdf?index=true
    • https://1374a94f-77d9-4514-b155-1300c342f26a.filesusr.com/ugd/7a359d_c54df5b6859c44d4a21e7de07918701f.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0481/1771/0999/files/lomekofokufupej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4342/files/tufuwejutimivok.pdf
    • https://43af51e1-c4e7-48a5-b10c-c8f7c8b201d9.filesusr.com/ugd/bd5c68_8463612b33cd4206bbec5e676c842db3.pdf?index=true
    • https://2ca778cf-ce10-44f6-ad30-31b9a25aa479.filesusr.com/ugd/6203b9_d984295624174fd1941cb031183612a7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004274.bin
625e7510844c0cd78af53e7b39171760b6f64b16f7b4f7d8f4608013406cb1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4274 5084 bytes
font_01_sfnt_off0000539e.bin
26e0e8b2de55454ecb13d622a54007fd0afccd5efc1617103a8f2b2df646d4da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x539E 9200 bytes
font_02_sfnt_off0000731c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731C 4324 bytes

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