Malicious PDF — malware analysis report

Static analysis result for SHA-256 688fac22a36162bb…

MALICIOUS

PDF

44.1 KB Created: 2020-08-24 15:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a703274dcd3bba0a7f4ad77069f4eac6 SHA-1: 0ce43555634926f69209cc818615860e6578df7c SHA-256: 688fac22a36162bbffa7211aad37f81fc7c7c57538f47d82b1992ab0a9aa9f0d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many of which point to Shopify-hosted PDFs. The primary malicious URL identified is https://ttraff.cc/pify?keyword=bootstrap+template+for+asp.+net+c%2523, which is likely used to redirect users to further malicious content or phishing 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.cc/pify?keyword=bootstrap+template+for+asp.+net+c%2523
    • http://kavigak.mivestido.net/uploads/1/3/1/3/131381078/jimanod.pdf
    • http://lorame.threadscorpuschristi.com/uploads/1/3/0/9/130969352/47eb2ac3.pdf
    • http://files.whwrestling.com/uploads/1/3/0/8/130873717/tigetozejesevuj-kevoxizolisefug-bofofumuzu-danazinabu.pdf
    • http://files.perennialplanters.org/uploads/1/3/1/4/131437676/pemamet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5285/9543/files/91019737986.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6869/files/busokotilikepizejeroki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64255738852.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/assizes_of_jerusalem.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/tijaranikoroxinaser.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/catchphrase_quiz_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5539/0630/files/linear_inequalities_with_two_variables_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/92853395494.pdf
    • https://cdn.shopify.com/s/files/1/0433/9980/7126/files/68844060575.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/92960228486.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/51325992959.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_off0000621b.bin
12a34e0c26371dcbf88d5a67ec29ee339117f9ee95e67b116c730737245eea1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621B 5240 bytes
font_01_sfnt_off000073e2.bin
405c73e7c22839a130d9c8691ba989cb62dff26318b6755962ec249262852d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E2 15320 bytes

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