Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ad06b779d4deda…

MALICIOUS

PDF

39.5 KB Created: 2020-10-09 03:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: be8f6dc3eab598560926d323983a5640 SHA-1: 805962e7f58f4c928f875c0b1439b4eeac8ce0d5 SHA-256: b8ad06b779d4deda75236f03a8a2355c38fe26676073860c26e2f4d93eb733fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead the user to harmful content. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure related to a TV show to encourage clicks. The ML classifier strongly supports the malicious verdict.

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.link/pify?keyword=gordon%2527s+great+escape+s01e01 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0494/7351/9783/files/87311524291.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2379/7911/files/71969000810.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/vexumogusig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7859/9066/files/craigslist_maui_jobs_labor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4862/3510/files/be_more_chill_squip_actor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0812/9185/files/mesomomelokenuzozekeropij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0456/4552/9255/files/gillette_seating_chart_football.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4814/0949/files/25402789130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3540/1111/files/secret_history_of_the_mongols_igor_de_rachewiltz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3903/8359/files/nefipixokeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fe91cc-f77e-415c-a25f-9acc14a3d714/xalevozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3f0174-f17e-4f4e-8070-0499bb327311/69060527819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e1ce65-82a8-426b-8a8e-0c18eb0c3ea9/15844956507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4467b06f-da3f-4c99-87e8-8ff4d5801684/95263670863.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB6 5208 bytes
SHA-256: 96fdd061698f1f5f087f4b800c3c31dec59e603f84a7c911811c3d48284b75c9
font_01_sfnt_off0000617b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617B 9876 bytes
SHA-256: 21b230863e846a278bfe32e5e8f96bb970fadc249f44ff0a08a7b64441089fd8
font_02_sfnt_off0000835a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x835A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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