Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f052e3e92ad7993…

MALICIOUS

PDF

45.3 KB Created: 2020-08-10 08:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36839957213ba4b8c03fd84ce56e583a SHA-1: f11514f8bd777a68beddb0cf460e1b3d34cc4258 SHA-256: 6f052e3e92ad7993d9ad599b3dadff5c7a1ff1b04c483bc8b71c1fae48fa1660
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 external PDF files, suggesting a link farm or SEO abuse tactic. The primary malicious URL, https://ttraff.ru/pify?keyword=epictetus+discourses+pdf, is identified as a redirector, likely leading to a malicious payload or phishing page. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, reinforcing the lure.

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=epictetus+discourses+pdf
    • http://files.crossfitliveloud.com/uploads/1/3/0/9/130969352/5038501.pdf
    • http://files.wordsoundguide.com/uploads/1/3/1/0/131070888/vowupelugezipatab.pdf
    • http://files.familycookbook.org/uploads/1/3/0/7/130739740/b8f212c0.pdf
    • http://files.solutionsforenergy.co.uk/uploads/1/3/1/4/131438583/3011067.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5838/7349/files/10252376292.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/93981457584.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/rewakudaravuxenu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/japawid.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/ggplot_bar_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/barron_s_essential_words_for_the_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/fovodid.pdf
    • https://cdn.shopify.com/s/files/1/0428/3524/7271/files/xozapa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6609/6802/files/google_slides_size.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/sewagonanolizunowidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3935/0181/files/denizaxubezipikaxidaweke.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_off0000671a.bin
7c056952af8aaf5f477c5c5120ffe755c55a862159f21c77351ab9813493fd66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x671A 4640 bytes
font_01_sfnt_off000076f9.bin
a9bcf700318e422026b47c8648bf3776a8b3fd7406271fd860facb508de967c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F9 10316 bytes
font_02_sfnt_off00009a00.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A00 4324 bytes

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