Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cc374b1ea37c84…

MALICIOUS

PDF

40.6 KB Created: 2020-08-19 00:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5def35632ef1e6a169fbb4e7820d4a77 SHA-1: ecb2dfd1064c7106df8f25a5ddfff3489cac5701 SHA-256: 02cc374b1ea37c841b56775a2a5507fa9589fc1661e4f777956095266078787e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to educational materials, specifically a 'division test worksheet grade 7'. The primary malicious indicator is the link to 'ttraff.ru', identified as a malicious redirector. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful content.

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=division+test+worksheet+grade+7
    • http://files.joseluisperezjim.com/uploads/1/3/1/3/131383553/gejuxab.pdf
    • http://govibazu.jkcakecreations.co.uk/uploads/1/3/0/8/130874523/zibig.pdf
    • http://files.cccchemp.com/uploads/1/3/2/6/132682565/gubiji_wofevupu_nunimalitid_xukovokipus.pdf
    • http://sotuzex.rachelsword.com/uploads/1/3/0/8/130874493/5d2ca1d3112.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/trabalho_sobre_administrao_estratgica.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1519/files/lost_in_the_deep_idle_champions.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/whitfield_pellet_stoves_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/nageze.pdf
    • https://cdn.shopify.com/s/files/1/0435/6826/7423/files/arabic_calligraphy_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5449/6935/files/acquisitions_incorporated_tg.pdf
    • https://cdn.shopify.com/s/files/1/0437/4695/1319/files/adams_tax_forms_helper.pdf
    • https://cdn.shopify.com/s/files/1/0444/5500/2279/files/bonjour_de_france_a1.pdf
    • https://cdn.shopify.com/s/files/1/0434/4283/1522/files/nuvij.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/22392635907.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/highland_cathedral_bagpipe_sheet_music.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_off0000606a.bin
e2cfef9b194751fda9d7829cf042362cb9f2372943c89c47437654a353dd1374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606A 5352 bytes
font_01_sfnt_off000072b3.bin
c831f335109a8843f0aec45ba6361e9674e32391bb2af262d1e90052f4c8be2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B3 10256 bytes

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