Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1a816971b1cb14…

MALICIOUS

PDF

41.8 KB Created: 2020-08-14 10:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80742515811aecae6b51e282f6b09098 SHA-1: 0d1eee36b5a6559b43be013bf00cbf7609a67a24 SHA-256: 7c1a816971b1cb14a61ea0c4fc9f582f46c12df9a036e643b651df8e148b3142
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 are designed to appear as legitimate educational resources but ultimately redirect to a known malicious domain (ttraff.com). This technique is commonly used to distribute malware or phish for credentials. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-optimized PDF links further supports a malicious intent to drive traffic to potentially harmful sites.

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=commas%20practice%20worksheet%20pdf
    • http://files.newsummitacademy.com/uploads/1/3/1/3/131378990/c10b66e7.pdf
    • http://files.speakeasyleather.com/uploads/1/3/1/4/131453031/jidaka-febugedujimusep-zuzuki-goboma.pdf
    • http://xejezu.pinetreecottage.com/uploads/1/3/0/7/130739206/basum_gowakobev_gumesosonomazu_muxuvitijiso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/articulos_cientificos_cortos_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/23928202320.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8498/files/lafexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/vageleridelixudodonubom.pdf
    • https://cdn.shopify.com/s/files/1/0432/8482/4222/files/budgetary_control_and_standard_costing.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77084518355.pdf
    • https://cdn.shopify.com/s/files/1/0428/0310/1863/files/xogapidesofesasasaziru.pdf
    • https://cdn.shopify.com/s/files/1/0435/5502/9141/files/geliromapejavilimadogemis.pdf
    • https://cdn.shopify.com/s/files/1/0437/3312/3221/files/vasem.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/roseronew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/36655354873.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057d6.bin
69820ad883f2266d4544a43bb4a2bc9cbebdaf04446a6c0a97abbd963bdc3120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57D6 5224 bytes
font_01_sfnt_off000069ab.bin
cc0eb0d54ae431862a5268d9c5cb018e83d733e5cd39165b94899989d0c7e7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AB 10216 bytes
font_02_sfnt_off00008c97.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C97 4324 bytes

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