Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d09b61e8cce2e16…

MALICIOUS

PDF

41.5 KB Created: 2020-08-03 17:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f6c97eb8ad93ddc6de22a99525cd6b SHA-1: ed402e915fcd72f3b6f587e019700f947af1d52f SHA-256: 5d09b61e8cce2e16a57aa6150818a23f88b97ab7c791fcea806224fab1c1cd83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites, potentially for phishing or malware downloads.

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=american+slang+words+pdf
    • http://files.mrshemlersclass.com/uploads/1/3/1/3/131380177/3b89356c.pdf
    • http://files.codexpolaris.com/uploads/1/3/1/8/131856852/xepotil_welaraliwese_pazinukupa_bivanuwolizabos.pdf
    • http://files.crystalconnections.co.uk/uploads/1/3/1/8/131871704/zojelosizaluvi_furabifet_kijufuxiroge.pdf
    • http://files.apwilder.com/uploads/1/3/0/7/130740363/jutixenajoromiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/suwibumabitalunatinu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/wuwivajoxejoxunokaturan.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/kudeziroxosiluxaluze.pdf
    • https://cdn.shopify.com/s/files/1/0432/0450/9853/files/gavuvas.pdf
    • https://cdn.shopify.com/s/files/1/0431/5719/2853/files/blender_merge_vertices.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1041/files/11401240751.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/princeton_review_sat_chemistry_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pidepuwavulosetanujerepub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3481/files/77076076736.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/99988776438.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/xanetolenape.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/numerawuwitoketiwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/da_form_5840_r.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/xolofolivi.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_off000064ea.bin
a6d6a850234456c7360fc1bbccccfc3d7b4bc8778007596cc62dbabe45a2fe35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EA 5556 bytes
font_01_sfnt_off000077c6.bin
280cbf63dce8c23bd43a1bebade95f17f9f5ec3956c5005e04a5820ebc4af779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C6 9768 bytes

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