Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6bbda455aaa0d0…

MALICIOUS

PDF

51.1 KB Created: 2020-07-17 15:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9e931744c63f97ee842c0f9a0bb9ac3 SHA-1: e82bac1055f3a5141e570859da7918a14d88207f SHA-256: ca6bbda455aaa0d0ad6c43f45d9fb0b971aa79817bb41fb8e4dbc445876d1c8c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to improve search engine rankings. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com', which likely serves as a gateway to malicious content. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, appears to contain metadata related to academic material, suggesting a lure to disguise the malicious intent.

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.com/wb?keyword=makaut%20organizer%203rd%20sem%20electrical%20pdf
    • http://files.relativeautonomy.com/uploads/1/3/2/6/132681740/6735403.pdf
    • http://files.linguisticanalysistools.org/uploads/1/3/1/6/131637224/7621853.pdf
    • http://files.wrestling20yrs.com/uploads/1/3/0/7/130775677/bd39095496405.pdf
    • http://files.clemonscustomwoodwork.com/uploads/1/3/0/9/130969974/fe93be0.pdf
    • http://files.hamanncommunication.com/uploads/1/3/1/3/131383588/vezaboke-gudupira-tafonisuzugiwil-fudenuwujatanej.pdf
    • http://files.stpaulum.com/uploads/1/3/0/8/130814342/sumafuropu.pdf
    • http://files.samhallsport.com/uploads/1/3/2/8/132814929/filoramojezeletazafi.pdf
    • http://files.massagemattersbynancy.com/uploads/1/3/2/6/132681033/9160655.pdf
    • http://files.0-archive.info/uploads/1/3/0/7/130738568/fapud_tovopo_wijanefuj.pdf
    • http://files.glasgowfeis.com/uploads/1/3/1/4/131453560/bonanatija.pdf
    • https://pujobat.files.wordpress.com/2020/06/kuwimuximabosuvosirevegu.pdf
    • https://xukitivusapu.files.wordpress.com/2020/07/75167165711.pdf
    • https://xalemogewal.files.wordpress.com/2020/06/dedaferukiwimipetuvuvapo.pdf
    • https://guremev.files.wordpress.com/2020/07/3977696089.pdf
    • https://vorosatigeb.files.wordpress.com/2020/07/vusobezijukuxalotelezijes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6635/9962/files/kisijebosebupuvoriwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/zirukidesini.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/zodox.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/seluluvazizuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tunamowari.pdf
    • https://cdn.shopify.com/s/files/1/0432/8669/1998/files/38526599692.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18813115042.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088f4.bin
1aa5f5395135256b3571afceb6dcf214c9cf2dbcafe9433a6aa46a0fbdd4d8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F4 5640 bytes
font_01_sfnt_off00009c25.bin
d0e48cb37df93a666995b2acde12ae26a3f6526ba3f139f5796c0df05e608a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C25 9976 bytes

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