Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f449012388c913…

MALICIOUS

PDF

114.6 KB Created: 2020-08-11 13:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 208eb13b090bf38cd8c22eacc79219f5 SHA-1: 407254586b3702ebaece09b066cc26c83983be22 SHA-256: a3f449012388c91398b422adf4026774373451e22e24151f834feeea08ce1542
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=the+pilgrim+s+progress+john+bunyan+pdf'. This indicates the document's primary purpose is to trick users into visiting a malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. 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://ttraff.cc/pify?keyword=the+pilgrim+s+progress+john+bunyan+pdf
    • http://diwulom.yourlocalelectricians.com/uploads/1/3/1/3/131398360/fowizepex-dobutojo-pojegubewep.pdf
    • http://files.sunkissedbridal.com/uploads/1/3/2/6/132695543/6814170.pdf
    • http://files.scrollsawaustralia.com/uploads/1/3/1/3/131382274/tisasowa-petoresev-logomix.pdf
    • http://files.nocontractppc.com/uploads/1/3/2/8/132814071/20b4adfaee3.pdf
    • http://files.ebc3.org/uploads/1/3/1/8/131856602/6552188.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1549/files/rotegezobaxekupo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3743/files/fetitidajaveda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/26729500418.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/58480834506.pdf
    • https://cdn.shopify.com/s/files/1/0444/4412/3303/files/arrest_search_and_investigation_in_north_carolina.pdf
    • https://cdn.shopify.com/s/files/1/0433/0592/6809/files/89923610187.pdf
    • https://cdn.shopify.com/s/files/1/0448/1653/1617/files/general_cognitive_ability_test_telkom.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/27208836634.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/92577758267.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/69647324346.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6735074847.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001560e.bin
990a6831e9b7f82d2c3507a3bd9eb093c6a78a14ef05a318e506bfe8fbd84f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1560E 5860 bytes
font_01_sfnt_off00016a3a.bin
5a1b7483c68cb255ce168d5f2dc82a72ca2293e5b3f312f8ad35ec2193f38afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A3A 5720 bytes
font_02_sfnt_off00017d90.bin
e7eae236ef2c6122aefdb4017ea8afe59a38ec0bbb1a257a43558847c9bf09ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D90 13048 bytes
font_03_sfnt_off0001a719.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A719 16204 bytes

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