Malicious PDF — malware analysis report

Static analysis result for SHA-256 6156ca9ec848496f…

MALICIOUS

PDF

45.1 KB Created: 2020-07-16 01:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 380d932fcf1700f6f89ff15eca246a29 SHA-1: ad740ce0a584998317221c72f3a63936353360dd SHA-256: 6156ca9ec848496fb0f9327ac090cb242d79db042ba9bcd81a6ea0727b5d54c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

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.com/wb?keyword=relativistic%20hydrodynamics%20luciano%20rezzolla%20pdf
    • http://files.sarahfowlergraphics.com/uploads/1/3/0/7/130738883/53506.pdf
    • http://files.andrewpoppleton.com/uploads/1/3/0/8/130815009/tazijejovesosarobopu.pdf
    • http://files.atthehelmbluffton.com/uploads/1/3/1/4/131438570/e1ad45c013.pdf
    • http://files.bathboutique.co.nz/uploads/1/3/1/0/131070152/sejiwisukuwawago.pdf
    • http://files.theoxfordscientist.com/uploads/1/3/1/3/131398221/6598316.pdf
    • http://files.projectechelonracing.com/uploads/1/3/0/7/130775192/nezasuromudigene.pdf
    • http://files.yummiiyu.com/uploads/1/3/1/8/131871956/sirilivaxor_kabinoxem_tanopeletud_dugarabamemi.pdf
    • http://files.lafayetteschoolrestoration.com/uploads/1/3/1/3/131398357/nutuva.pdf
    • http://files.risingravenband.com/uploads/1/3/1/3/131384018/buvab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vomaxepe.files.wordpress.com/2020/07/goxozukemajufulufigefi.pdf
    • https://wajafumetu.files.wordpress.com/2020/06/widatemiwodasevimuzujab.pdf
    • https://fegiduv.files.wordpress.com/2020/06/votezaro.pdf
    • https://jejiwivu.files.wordpress.com/2020/06/dirumanebewufabukafabodiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2981/files/28905815820.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/93693613657.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/57716902913.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/bisudajorowoter.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7777/files/lobukutugusi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/37973207536.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/zadapatofokugigarorokifef.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_off00007281.bin
3364c72b2bf03bd86c73c106b88e9d0ddd782c3487cb38f9180739ebf5e39d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7281 5496 bytes
font_01_sfnt_off0000850d.bin
ac6adf84f6bd9f689d05dd5441a8caa025a9589aa7753b413e8d85cbf747b9bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x850D 9816 bytes

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