Malicious PDF — malware analysis report

Static analysis result for SHA-256 021c27068e1612f3…

MALICIOUS

PDF

38.1 KB Created: 2020-08-21 00:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2030f843f2bf7403a0d98125a2080776 SHA-1: 72b926013c39886588df2ab00ba349fe31a3cd3b SHA-256: 021c27068e1612f3af3c662598061987fda4cf50c99ef360aeacdafa293278e7
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 Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=chimusebo+by+afunika'. The ML classifier strongly indicated maliciousness, and the overall structure points to a phishing or redirection attempt.

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=chimusebo+by+afunika
    • http://ferufut.northshoremusicschool.com/uploads/1/3/1/8/131856643/3188124.pdf
    • http://files.ehagfinearts.org/uploads/1/3/2/6/132681916/wenenodumedoji-lesike-wogajivuponetaj-xavulatize.pdf
    • http://files.ethelbustamante.net/uploads/1/3/1/4/131406356/7012749.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/aastha_channel_full.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/herramientas_de_bsqueda_de_informacin.pdf
    • https://cdn.shopify.com/s/files/1/0434/8336/5528/files/dulewaximix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36103472339.pdf
    • https://cdn.shopify.com/s/files/1/0440/1732/0094/files/intern_survival_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3974/files/74758889875.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/rerunasebuvumogipepazale.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/91220725022.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/tinkers_construct_modifiers_1._10.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/nilugoxoragix.pdf
    • https://cdn.shopify.com/s/files/1/0435/5427/5479/files/obligation_modal_verbs_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0447/8841/6663/files/multi_stage_theory_of_carcinogenesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2225/files/highlight_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7543/files/fujibun.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_off000049ef.bin
645d50aed4f8bd5d5f052c837bfcc37b169a4e6c8f5d326271f5174ced616502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49EF 5012 bytes
font_01_sfnt_off00005adb.bin
6abf8e34f05e306c56062d2736df69ada907a3b258aa51ef6c533b396a904d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADB 10216 bytes
font_02_sfnt_off00007dc3.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC3 4324 bytes

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