Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7cf3268de47194…

MALICIOUS

PDF

41.0 KB Created: 2020-08-11 22:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c3d0107ff18e9311e0291f41c7e756c SHA-1: 357b53aab0057a79fbb88525a00705be2f64a159 SHA-256: ad7cf3268de47194266fd572d781f7b803eebf753cbc4a59753e064165bf0d40
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, which is characteristic of SEO link farm abuse. One prominent URL, https://ttraff.cc/pify?keyword=fichas+de+las+vocales+para+imprimir+pdf+gratis, is identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to free printable vocal worksheets, aiming to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=fichas+de+las+vocales+para+imprimir+pdf+gratis
    • http://nebazoge.apaveeperspective.com/uploads/1/3/0/7/130775677/xakulugukadek_bodotuzipur_werevesewuvu_kojuniratap.pdf
    • http://files.ryalphotography.com/uploads/1/3/0/7/130775528/4431512.pdf
    • http://files.cedaryogaspace.com/uploads/1/3/1/3/131384573/mumaridel_dugowolewewe.pdf
    • http://files.holycrossboys.com/uploads/1/3/1/1/131163898/jumerepugimaju_zixakawiluxuvow_kogetobowawe_demasisexipomi.pdf
    • http://files.thehavenfamily.net/uploads/1/3/1/0/131070518/43cd9af6d2c8d66.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/pokuzaropukidivoxu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/equilibrio_termico_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/44339926114.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/galaruvigufofubinadavitir.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7266/files/62081073509.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/67006250707.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/86709355599.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/girotimovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/66791572414.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2440/files/90363709562.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16994954809.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_off00005e96.bin
466ccb0ae72cd46476d8682ee594ee7d23edc97df75778296a190d254d318215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E96 5584 bytes
font_01_sfnt_off00007175.bin
8e5e0a795320714e7be5bb06e8a3a4b07f3508340e5bd0e8f1cb5d97ba590ace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7175 10944 bytes

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