Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66d22c0d73065eb…

MALICIOUS

PDF

40.1 KB Created: 2020-08-08 01:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f4bad723ed1e6b6d363673c85908e0e SHA-1: 05e1501f938d2dc542622e6ed436aec2c01ad067 SHA-256: c66d22c0d73065eb6a51448d8a11bb7180b91b254486df73867e53e3dc900da4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=recirculating+aquaculture+book+pdf'. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

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=recirculating+aquaculture+book+pdf
    • http://files.northernsmokers.com/uploads/1/3/1/4/131437464/sodom.pdf
    • http://files.thelinksconnection.com/uploads/1/3/0/8/130814432/votaz-katirigaj-jolodoraziw.pdf
    • http://ribatexek.leanasykescounseling.com/uploads/1/3/1/3/131398140/duwuzutit-nukibeg-bojimidamen-tidifisud.pdf
    • http://files.gabreedesign.com/uploads/1/3/1/4/131452824/buvoxolagivufife.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/korean_verb_conjugation.pdf
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/piano_beginners_songbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/1961/5904/files/proyecto_de_grado_telecomunicaciones.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/63446090524.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94766401197.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/bratstvo_crnog_bodea_17.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/fulosimewawir.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0711/files/linoguguserakimikaxadovi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/wefafalarusu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5797/files/nukezibugepurebisovezomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0039/files/adobe_photoshop_7._0_tutorials_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d3e.bin
77bc512c5c205ca79cd307dc2d9e4f90a789e5a23fa9a6991405f4e6fc02377d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D3E 5364 bytes
font_01_sfnt_off00005f78.bin
af767fa78dd2d60467074b5a0a3cf0f479db147a2d9e8f6be9de68425bb6210d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F78 10712 bytes
font_02_sfnt_off0000838a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838A 4324 bytes

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