Malicious PDF — malware analysis report

Static analysis result for SHA-256 042f536b19f4519c…

MALICIOUS

PDF

34.0 KB Created: 2020-08-03 06:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8192c178235e7c4786a284aa7a9538a3 SHA-1: 48562e4db63ba6cd458572ea547e115daf9da287 SHA-256: 042f536b19f4519c68e049a2bd1e91d3404edf5521f19f48a1b9fdc66f0b94e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL suggests an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains URLs that are part of a link farm.

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=portfolio+lighting+manuals
    • http://files.paranormalworldofgsreynolds.com/uploads/1/3/0/7/130776726/5c88f6471d.pdf
    • http://files.brianskitchens.co.uk/uploads/1/3/1/8/131872037/xonisekadisazekob.pdf
    • http://files.thegoldenpegasus.com/uploads/1/3/1/4/131453267/zitexifesuguka.pdf
    • http://files.indianaaeop.com/uploads/1/3/1/4/131438539/0eea295ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/highway_engineering_and_traffic_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/jisudovejusezuwav.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/70946561785.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/background_image_size_css.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6785/files/32605537887.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/vertical_center_css.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/warhammer_40k_tyranids_codex_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/woxumilaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/jerapufezebiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/vakubobepivevajadajigawon.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/rokifuvasamekemudofedusip.pdf
    • https://cdn.shopify.com/s/files/1/0431/7210/2308/files/tuvixatafofedawewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/95563677483.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_off00004916.bin
55f445bff61090802ad58208ef28e9a77e19148fe6f75ec413e1965be36c8d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4916 5184 bytes
font_01_sfnt_off00005a83.bin
06ca8d77c8846da791458ff00933cf79e7fc2a25ba605453f079870ba7a3024c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A83 9536 bytes

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