Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b96f1676f599210…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 15:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1f790575943f0f062d4389ff11e968f SHA-1: 4cc8eac30d1093d5543512a504daefe38e063c3d SHA-256: 6b96f1676f59921065504dcf8f2d45ab3903b62566686ef1c20439ba472e6340
154 Risk Score

Malware Insights

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

The PDF contains a deceptive lure, presenting itself as an admission test paper to encourage users to click embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=admission+test+paper+for+class+4+pdf'. The document also contains a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of malicious links and the deceptive content strongly indicate a phishing or redirection attack.

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=admission+test+paper+for+class+4+pdf
    • http://nivezaj.gpbballstore.net/uploads/1/3/1/4/131455069/pujobomamaxoxuf.pdf
    • http://zuxete.jerusalempoemscroll.com/uploads/1/3/1/6/131636725/gebogamewudi.pdf
    • http://files.michaelallenshatto.com/uploads/1/3/1/3/131382590/wezesitokovag.pdf
    • http://files.courtneytravels.blog/uploads/1/3/1/4/131406885/20409821677efd8.pdf
    • http://files.srrlsf.com/uploads/1/3/1/3/131380868/4f04903295aa5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/98337234006.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/fexadijogadokodomek.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/tawowopakatow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/anganwadi_mpr_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/zurabevepuwexu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9577/7699/files/35065675342.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/avery_template_8163.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/potewipabeludufifa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/2129261195.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/nudafitutak.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_off00006677.bin
e85c152f8b8fe4069e6085208d0745f763cffdef28291c8f78a77c2469bd5a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6677 5380 bytes
font_01_sfnt_off000078a9.bin
621144ccb9c0eac76bd23d1fa8c3393d822f84c8a609188e52f35674eb9b5be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A9 10128 bytes

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