Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6053f3e588a6b3…

MALICIOUS

PDF

40.2 KB Created: 2020-08-12 19:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8863eee143189e5f101f0b9877cc35e7 SHA-1: 2c84fdec1348b6539c05703e8c2f1f9973deaed6 SHA-256: 0b6053f3e588a6b363c606439cf98ae73a9985f3da9c8dc493a3ddb4a87217bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, many pointing to what appears to be a link farm designed to mimic book downloads. One of these links, 'https://ttraff.cc/pify?keyword=ergonomics+pdf+book', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect users to malicious infrastructure.

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=ergonomics+pdf+book
    • http://files.cdebtherapy.com/uploads/1/3/0/7/130739525/kalelepamajuwibi.pdf
    • http://files.teamvogelvscancer.org/uploads/1/3/1/4/131483138/pinafezuf_rumewa_xekiroditaz.pdf
    • http://files.blueheronherbary.com/uploads/1/3/1/0/131070230/zebog_wurasa.pdf
    • http://wudexoto.elizabethtabish.com/uploads/1/3/0/8/130813528/5154119.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/jajibujifadetuxamerareluw.pdf
    • https://cdn.shopify.com/s/files/1/0455/7815/8245/files/aashto_green_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/kosifakigovotunepoziro.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3074/files/gidedubobotoginaniv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/lirinolesiwupewarisanutaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/8918/0310/files/fogurexapavawebugujip.pdf
    • https://cdn.shopify.com/s/files/1/0453/6434/7035/files/fitanikitikebekafuxeja.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/19592118847.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/vurelidezofotejilufeje.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/biophysics_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/a._o._a._c_official_methods_of_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/pukewebi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2201/6934/files/4921693609.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/bubomadodozebeziko.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/5539892125.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_off00006060.bin
cfcd53889f9918ee1395b80d01f42bcdb208a115938308dbdaf06f4e4cb166e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6060 5396 bytes
font_01_sfnt_off000072a1.bin
2a13c63b8f3e6e4f101233690a8e7d16e6f5259ce31867d0f9542bf72e0ed314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A1 9804 bytes

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