Malicious PDF — malware analysis report

Static analysis result for SHA-256 904c36dcf2965615…

MALICIOUS

PDF

36.1 KB Created: 2020-10-16 09:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6c45f84cf480d0f44161c6dac52ea6b8 SHA-1: 970f3ec7c6e8f8d7a14b2cc04358a221acb4249d SHA-256: 904c36dcf2965615608d0075b32808bcb7fe1ace5f08b514c52c076cd576c4c7
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes text suggesting it is a 'free PDF scanner program' and references wkhtmltopdf, indicating a lure to trick users into clicking these links. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/pify?keyword=programa+para+escanear+pdf+gratis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f888b03e06e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f88fc1866f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f8873170f06c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5f8837e8200c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f875f98dd7e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f88460fe48ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f87388be6a9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f87062624ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f873c0584024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9a26ee-c314-4a45-b37d-d25c3e041cbf/95562018526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0a19b2-0bd0-48c4-b2f1-4b23ae164f70/zonunegiselopozijejat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ed535c-2712-48f2-a045-df2e5b2d45b6/70610667382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/final_fantasy_7_original_pc_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4700/0983/files/one_page_business_plan_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4394/5622/files/5982348995.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/reebok_zr8_treadmill_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4330/5110/files/60216096979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0826/1784/files/20800194060.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_off00004e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9F 5444 bytes
SHA-256: 47b9e4b9db09e77e2f9b7086bec34791078427cd65d5122ccbcd8e0a200aa8b8
font_01_sfnt_off00006107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6107 10544 bytes
SHA-256: 606e1fe8bc6e5934a2d2d427be2b0db7134dd494df059fa1406339b5a1062643

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