Malicious PDF — malware analysis report

Static analysis result for SHA-256 0039571beb865366…

MALICIOUS

PDF

39.7 KB Created: 2020-09-15 02:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e929cbffdfce27dad8fb98d2bba9e99a SHA-1: dd4b367d68efaf518c6276aa596c0fd217f775df SHA-256: 0039571beb8653663499cb9d9d0bb62b2cf54a21838952de1744b12f1fee7b8d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is likely used to deliver a secondary payload. The document body and embedded links suggest a lure related to educational contracts or worksheets, aiming to trick the user into clicking the malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure itself contained numerous links, many pointing to benign Shopify URLs but one critical link to the malicious redirector.

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/pify?keyword=hudson+public+schools+teacher+contract
    • http://dojopiwi.newlifeministriesihod.org/uploads/1/3/2/6/132681579/9decd844.pdf
    • http://files.tipsyglasswinery.com/uploads/1/3/1/4/131452903/4773e7.pdf
    • http://wurok.lunaintegrations.com/uploads/1/3/1/1/131163635/d64d4b620.pdf
    • http://xaxin.propertyhomes.org/uploads/1/3/0/9/130969352/janux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/elements_of_drama_worksheet_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/zexuvamurogutijirofamo.pdf
    • https://cdn.shopify.com/s/files/1/0470/6720/1704/files/variwepibufudamenulotibep.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/potaxerifijaguvafanitu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/86959116573.pdf
    • https://cdn.shopify.com/s/files/1/0460/0148/8039/files/fakobatasi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/vobaxowizatekizubedomupu.pdf
    • https://cdn.shopify.com/s/files/1/0447/3470/9914/files/decameron_giovanni_boccaccio.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/80864203847.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9384/files/91457138292.pdf
    • https://cdn.shopify.com/s/files/1/0432/6830/9152/files/applications_of_derivatives_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/aptitude_test_study_material_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/72012713671.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/reading_and_writing_grade_11_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d6e.bin
90874f1299056fd565b40ec4e6f7ea1dce95ebb8fdcda1a9199f7de79e712019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6E 5260 bytes
font_01_sfnt_off00006f3f.bin
f7aa58ae1e7f8860c18bcf31320027aa484d180708a980df937e8f599947b2f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3F 10100 bytes

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