Malicious PDF — malware analysis report

Static analysis result for SHA-256 0342e0bca066b456…

MALICIOUS

PDF

52.9 KB Created: 2020-10-03 01:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b0abf357fdc3fb4a8ef516f3941a9b6c SHA-1: ae52f9e6130deb5fc27d02d011fc843ea41621fd SHA-256: 0342e0bca066b45643736c3dccf8b9ecee8545c9ca208037385c437dfa5c475c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a URL associated with malicious redirector infrastructure, specifically designed to lure users with keywords like 'download apk windows 10 insider tool'. The document body, though heavily obfuscated, contains a similar URL, suggesting an attempt to trick users into downloading software. The presence of numerous external PDF links further indicates a link farm strategy, likely for SEO manipulation to increase visibility of malicious content.

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://cctraff.ru/pify?keyword=download+apk+windows+10+insider+tool+to+windows+pc.+hidden+content In PDF document text
    • http://files.walkthruyoga.com/uploads/1/3/1/0/131070579/27a4faa253d67d.pdfIn PDF document text
    • http://files.valleyfloors.com/uploads/1/3/1/8/131871871/jeturob.pdfIn PDF document text
    • http://files.akasl.org/uploads/1/3/2/6/132681877/xafiw.pdfIn PDF document text
    • http://files.vfconseiletformation.com/uploads/1/3/1/3/131383424/dides_wuridejigakopir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4639/8870/files/dex_weapons_dark_souls_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6244/3688/files/dalenoxilupizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9721/8460/files/63412624770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d67e2a5a-a255-4edd-9a5a-f2edc054b63e/raxotuzuxadexutaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e1bee1-3785-4b9f-add3-ea132fe8fcdd/gixiwamijupemugitorawavaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6735e971-c512-4853-8a18-0a90ef894f3c/kiraxalofexaketesod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd84499-6589-4b63-a301-1a4f8517b9de/lizafexabarev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12ae9f6-6030-4d55-ad84-2ab7db2dbac8/xemumepununawerofuzipaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b19a33f-f277-47d6-9b0e-f8ef4f781b2c/47460571931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55364961-60c8-4da8-80d3-64ae06b60b24/rizaxobegeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245e5bfb-bd7e-44dd-848c-c0050ca2e479/51430361742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75699be6-30fe-4a86-9e79-8ebe988fb481/baguzemebosev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB0 5540 bytes
SHA-256: 7f994dde4fdc0fefe217317fb75b44c236cb227a0ff1220c61fd4468c4d509c6
font_01_sfnt_off0000a0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A6 10864 bytes
SHA-256: fd1b2cc95bf0cafddbff9d5026351523c943e97421bf47b986b9bfc3daec4d01

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