Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b0a209b6c6cd0e…

MALICIOUS

PDF

43.1 KB Created: 2020-08-03 22:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1f7d0bad9b1b3e9833b071293a1e3ed SHA-1: 3b0b5a9826ddca8e89e89a7f93b9f387813a8949 SHA-256: 70b0a209b6c6cd0e75b6b0928522129251cf28dbb066c9075ca3b686819d25c0
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results or lure users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection or phishing.

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=bill+nye+biodiversity+pdf+answers
    • http://files.detectiveswilsons.com/uploads/1/3/1/4/131407102/5270562.pdf
    • http://megoxe.buybps.com/uploads/1/3/2/6/132696030/forodixomiber.pdf
    • http://files.necaconservation.org/uploads/1/3/0/7/130775242/55f95cb1e579.pdf
    • http://files.balhashel.com/uploads/1/3/1/8/131856041/e82e6df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/wajerelusiximubov.pdf
    • https://cdn.shopify.com/s/files/1/0428/7964/7903/files/banusik.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/dust_of_disappearance_5e.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/agenda_2020_telecharger.pdf
    • https://cdn.shopify.com/s/files/1/0434/2952/7709/files/green_guon_stone.pdf
    • https://cdn.shopify.com/s/files/1/0434/0560/7070/files/79909004198.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0449/0412/0475/files/how_to_fix_an_overwound_clock.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wonazonuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/naluzekofijatiroxutu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4225/9612/files/pogiloruvijesenuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/vonuvitamikimil.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/73732947157.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005498.bin
bb0dfdfaf561651abcbf48917683a0a3aeb3f355a52b48b8512addb2b0266a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5498 5476 bytes
font_01_sfnt_off0000675c.bin
34e5a89afbb49d76ccd6f1e2c2ddf4fea9ecbcb744fc11d8fb4272aa60839bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675C 10244 bytes
font_02_sfnt_off00008a71.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A71 16092 bytes

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