Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ec8fe3b85c8c21…

MALICIOUS

PDF

42.0 KB Created: 2020-08-01 16:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 005221d6de119f99c7f3eae5e5145542 SHA-1: dec1c20bf9220e4da6c7da2f3450dc9603a000c9 SHA-256: 02ec8fe3b85c8c21bae027ea924a1993ade9a1d8b739ba949818a1d41017e5f6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external PDF files hosted on Shopify and other domains, forming a link farm. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.ru/wb?keyword=pass%C3%A9%20simple%20ou%20imparfait%20pdf`, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=pass%C3%A9%20simple%20ou%20imparfait%20pdf
    • http://files.caryyurkiw.com/uploads/1/3/1/4/131408371/995869.pdf
    • http://files.maximevaporators.com/uploads/1/3/0/7/130739011/kijidejimawu_rabiki_sibupamupubibif.pdf
    • http://files.brentstrang.com/uploads/1/3/1/4/131454466/jofasoxoviveta.pdf
    • http://files.lawn-rite.com/uploads/1/3/1/4/131483009/1650468.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/gerekagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/7108757464.pdf
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/gedadubofu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/68636606622.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0604/files/pifazexogugozelowize.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/21554141812.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/woxukufebib.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0486/files/gubowino.pdf
    • https://cdn.shopify.com/s/files/1/0437/2158/8888/files/44462591410.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/the_new_one_minute_manager.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6721/files/1867969179.pdf
    • https://cdn.shopify.com/s/files/1/0440/7109/2376/files/heathcliff_as_a_byronic_hero_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0435/8438/9275/files/37813525432.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_off00006311.bin
922ad9a9202d1b25a72fa1a6ea4a85dbae358f7adcb30b9c7018871a13344094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6311 5328 bytes
font_01_sfnt_off000074d0.bin
c249afd81faa76f02f51ce013a1780b2333234cf96f876c886953d8b497f4f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D0 11680 bytes

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