Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bc944f6bbda0fa…

MALICIOUS

PDF

41.8 KB Created: 2020-08-18 15:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 584876ddf2e1bfc7c5bf6f737746d97d SHA-1: e431c235abe744f5d7ce478342e409f7664f7771 SHA-256: c1bc944f6bbda0fad01c74cf84b9ee3a53c718bd1ccba5def1ce47b43264ea98
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for downloading 'Bitdefender free windows 10 64 bit'. The document body, though heavily obfuscated, contains the same URL. The PDF also contains a link farm heuristic, indicating a large number of external links, with the dominant host being cdn.shopify.com. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or downloads.

Heuristics 3

  • 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.
  • 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=bitdefender+free++windows+10+64+bit
    • http://files.christopherenston.org/uploads/1/3/0/8/130814902/1437365.pdf
    • http://biludaroj.judithasem.com/uploads/1/3/1/4/131454440/07e9a6.pdf
    • http://goguriju.southernidaho.org/uploads/1/3/1/3/131380755/lilem-mifevoveka-buwutolozalo.pdf
    • http://nivivo.kouturexprice.com/uploads/1/3/2/8/132814930/nepuj.pdf
    • http://nivivo.kou
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/xikulibe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6441/6661/files/sims_4_remove_mosaic.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/zigasa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/79707907752.pdf
    • https://cdn.shopify.com/s/files/1/0434/2284/3036/files/piguped.pdf
    • https://cdn.shopify.com/s/files/1/0429/6612/2662/files/67291641569.pdf
    • https://cdn.shopify.com/s/files/1/0430/8392/3609/files/applications_of_partial_derivatives.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/bokomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/navukoputofabexap.pdf
    • https://cdn.shopify.com/s/files/1/0431/3553/3218/files/teachers_interview_questions_and_answers_in_english.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006487.bin
3072889bd51d6517b84fc7bf1d915f7a7f42690abf135ca9ba22ab5bd85eeab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6487 5376 bytes
font_01_sfnt_off000076f8.bin
7e13a1518d6055fed0d752c589048b4927896e100aef058f0f4884cd98220343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F8 10296 bytes

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