Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9f5032d8dae388…

MALICIOUS

PDF

36.0 KB Created: 2020-07-11 07:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5db7a8dc9b305a19cbe3b8c78c693d7 SHA-1: 5573a0b161f1d3bbcbe3d049c9422fbc14feded8 SHA-256: dc9f5032d8dae388759aa08af6e61f4ec13276a5452633314b48c1c3f5ddb800
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to a link farm designed to obscure malicious redirects. The primary link, 'https://ttraff.cc/pify?keyword=chicken+biryani+recipe+pdf+in+hindi', is a known malicious redirector. The document body, though heavily obfuscated, contains text related to a recipe, likely serving as a lure to encourage users to click the embedded malicious link.

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=chicken+biryani+recipe+pdf+in+hindi
    • http://files.oharts.net/uploads/1/3/0/7/130775242/43bbe548d08d.pdf
    • http://files.mskhor.com/uploads/1/3/2/6/132682570/fewogedawox-xabuguj-dajelenudunexo.pdf
    • http://files.springstreetcwf.com/uploads/1/3/1/3/131383621/3205187.pdf
    • http://files.defineandfree.com/uploads/1/3/0/7/130775111/xajut-mivaxamobikenod-pozenovuto-xinut.pdf
    • http://files.ranranlu.com/uploads/1/3/2/6/132695332/gavizifigobewu_legovewa_femavejalug.pdf
    • http://files.loonfeatherleather.com/uploads/1/3/2/7/132740639/jotakulezow-dimemowa-jenizu.pdf
    • https://litatal.files.wordpress.com/2020/07/sofarasinekud.pdf
    • https://rivetivepet.files.wordpress.com/2020/06/fubaxuleduw.pdf
    • https://nimosafada.files.wordpress.com/2020/07/xajovikerenizujo.pdf
    • https://boxuxabu.files.wordpress.com/2020/06/37641946501.pdf
    • https://walixamitava.files.wordpress.com/2020/06/80917455152.pdf
    • https://noginamopak.files.wordpress.com/2020/07/xakajenetibep.pdf
    • https://ruvewarudab.files.wordpress.com/2020/07/jagumuxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22537170944.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1589944702.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/burixuzogobeliponupafi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/16219475651.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/59080963311.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004faf.bin
55b738f49f57ce9f887146f994b60c0cafb80aed93a5e5ac05fbd400295430c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAF 4960 bytes
font_01_sfnt_off00006074.bin
e4f7f2d96a974dcabb16d93fff58a02ebfea0491b69980ed4b77406ed71264bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 9628 bytes

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