Malicious PDF — malware analysis report

Static analysis result for SHA-256 810d83980e159f77…

MALICIOUS

PDF

82.7 KB Created: 2020-07-14 02:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58704dab6e3239195fd13148c4ba19f6 SHA-1: 18d4cd7b4e746de23a07f4cb97bd3a68b2735740 SHA-256: 810d83980e159f77afaf89cf716497af80af21321a44941a29889567291e4a2c
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 what appears to be a link farm designed to manipulate search engine results. One critical heuristic indicates that a link redirects to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO spam.

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/wb?keyword=karya%20tulis%20ilmiah%20sosiologi%20pdf
    • http://files.art-asap.org/uploads/1/3/1/0/131070204/sopulowutenugifel.pdf
    • http://files.houghtonsofyork.co.uk/uploads/1/3/0/8/130815093/7293a.pdf
    • http://files.davidvitt.com/uploads/1/3/2/3/132302894/6a807cd933.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sotetusuveti.files.wordpress.com/2020/07/kifapazafegik.pdf
    • https://regowom.files.wordpress.com/2020/06/nuvozewabagememegenaz.pdf
    • https://gutagaperub.files.wordpress.com/2020/07/tuwulipuxetuk.pdf
    • https://kilabizusu.files.wordpress.com/2020/06/nifog.pdf
    • https://wazejiwifo.files.wordpress.com/2020/06/26294018977.pdf
    • https://begogimem.files.wordpress.com/2020/07/lukurotixozovurun.pdf
    • https://fesopalom.files.wordpress.com/2020/06/libojivubowiwom.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/59979995904.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/waxojinoxokamerunur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65545430121.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/dedutipikimasobakosup.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/pujutakevuvuneze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53978683100.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/winusulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/vabuziw.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_off000108ca.bin
f4eb243e3d79cf3f0da34f615852c245429da77f56fc32c578dfb271867cbde9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 5184 bytes
font_01_sfnt_off00011a7c.bin
8055bdf576ece626747a6d6e6a39ade4d93cd76ed6d60b6fdcd5151f533b9c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 10340 bytes

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