Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebbb212df660773…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 13:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4a8a6c9a868af2916555b4fede59e14 SHA-1: fb11ec6294c980db442247322303d97b75aaafe7 SHA-256: 5ebbb212df6607735df9bf46711bca17f3e3f333b0b154300c79ae6cb2e9b4b0
154 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous external links, with one identified as a malicious redirector. The presence of a large number of links suggests an attempt to manipulate search engine rankings or to distribute malicious content through a network of PDFs. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=botella+de+mezcal+en+forma+de+gusano
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_bbd587d567d54cbfa75066e5bd6bfa59.pdf
    • https://static.usrfiles.com/ugd/bf0735_fe7767d929c64ded9aa88a4e19efb512.pdf
    • https://static.usrfiles.com/ugd/5ad03d_b13006c6566d4861b5bda1256cc754fd.pdf
    • https://static.usrfiles.com/ugd/f3cb45_9a543933ce434899a9d6f23ab5d23b42.pdf
    • https://static.usrfiles.com/ugd/d1d005_39c97ce252a64f7cb670efc71bbd1760.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/60795174658.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/dipugofavizamano.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/sorawaxosajevopipekogufu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/50240646076.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/pozisulujigosesug.pdf
    • https://cdn.shopify.com/s/files/1/0461/1227/6644/files/80740718983.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/reved.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0797/files/zipibofepemidijogexexeno.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/bachon_ki_urdu_kahaniyan.pdf
    • https://cdn.shopify.com/s/files/1/0432/8338/2427/files/44216422061.pdf
    • https://static.usrfiles.com/ugd/8de238_8d96aaba3a2e4f67bb675ab4b764badf.pdf
    • https://static.usrfiles.com/ugd/078c79_578bc39dac8e48f4808765445f4c6b58.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e2332e9d968435c90a88c7900c7f6ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_4751f7d4a15641ada34b4cdae5cf1ed4.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_off00006285.bin
365fa0b891aa99c3f34df2f65d3f34cefc5cb4b65fe3f55d2a80551e8d280773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 5440 bytes
font_01_sfnt_off00007504.bin
86b47a79799111f806194fcc1b6419663958bf6c5af1a06ca575e28a6335b3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7504 11384 bytes

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