Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2e5544705014a6…

MALICIOUS

PDF

44.6 KB Created: 2020-07-13 23:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b17e0387ac9283029381ba11379c1cdd SHA-1: 4a01c4140476d4e1117a6af1b7465d6b5ecc023c SHA-256: 0a2e5544705014a6b4da8f9e5db3d31c975e7c492c66b709f24c1f4d8761717d
162 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to PDF conversion software, likely a lure. The presence of numerous embedded URLs, many pointing to benign Shopify files, suggests an attempt to blend malicious links with legitimate ones. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wb?keyword=best%20pdf%20to%20epub%20converter%20software
    • http://files.backcreekvcllc.com/uploads/1/3/1/4/131452733/999c2a8c049c610.pdf
    • http://files.liftoff-travel.co.uk/uploads/1/3/1/4/131412235/fagovidubakinadasem.pdf
    • http://files.christiansinculture.com/uploads/1/3/2/6/132695994/6334657.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/gumun.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/51256387293.pdf
    • https://cdn.shopify.com/s/files/1/0428/1185/0918/files/68081355583.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35117459625.pdf
    • https://jopawetudame.files.wordpress.com/2020/06/baxagekozufosibawimo.pdf
    • https://ripupuxu.files.wordpress.com/2020/07/4858092464.pdf
    • https://selegug.files.wordpress.com/2020/07/59147233004.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/52553042522.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0820/files/86113660488.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/43767810004.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/6900954608.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/kexukumamudegi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/tozojugamerabegaxekadis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vujunuvitiwowus.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_off00007010.bin
3158cbc5fbdb4e651027bfd15149dfdd957b6572b9e15f345605353b5229a88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7010 5292 bytes
font_01_sfnt_off00008220.bin
3d3c247636393e1d08b0892d82afd2e9061867be0afa25d45a2dd4dae52fb217		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8220 10276 bytes

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