Malicious PDF — malware analysis report

Static analysis result for SHA-256 732f1711b3946f53…

MALICIOUS

PDF

46.4 KB Created: 2020-08-12 17:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab5b1740bd0181f4feb3ed198317b80c SHA-1: 0eecfa894b903897ee45223ab65a258ae55e83d1 SHA-256: 732f1711b3946f536409c0a4150f69515a29d81b826322f0f79df1a6c2853144
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=kosala+book+pdf'. This URL is likely used to redirect users to a phishing page or download further malicious content. The document also contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic to distribute malicious content. 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.cc/pify?keyword=kosala+book+pdf
    • http://gixifef.liftislandfashion.com/uploads/1/3/1/3/131379362/8764926.pdf
    • http://files.opadental.com/uploads/1/3/1/3/131379594/539cbd45a69b.pdf
    • http://files.ryanballonlineportfolio.com/uploads/1/3/0/8/130814515/fofesifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/97980093387.pdf
    • https://cdn.shopify.com/s/files/1/0432/7584/5792/files/vobazidiju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kufotiniponekurek.pdf
    • https://cdn.shopify.com/s/files/1/0439/2802/7304/files/20005618934.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/muxefanuro.pdf
    • https://cdn.shopify.com/s/files/1/0434/0413/2508/files/99940532053.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/ncert_class_10_science_acids_bases_and_salts.pdf
    • https://cdn.shopify.com/s/files/1/0436/9943/7721/files/gonujekufamep.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/the_ultimate_kiss_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2002/files/2599425977.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/boiler_feed_water_pump_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3535/files/39329755299.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_off00006dde.bin
48404417b59cc55178d7dd0c254cbf82acee65af75657de6efc0f40b784b32f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDE 5112 bytes
font_01_sfnt_off00007f52.bin
23753fee9d003df5de164991bd80fd8fbd6ac1af761177ceb276e2a17587fa8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F52 9940 bytes
font_02_sfnt_off0000a1b3.bin
7828f37bcf3dcfe1ab1716748fc459e532a0e97fdd5253fa45e3e7042ed51a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B3 2776 bytes

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