Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc28d6d4af36842…

MALICIOUS

PDF

44.7 KB Created: 2020-09-16 18:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46871e3b1b0a734a48ff2770dcec592c SHA-1: 046b7c38882f2a29e732b54f2da283b21bdc3146 SHA-256: 0bc28d6d4af36842a323d31a6a37e25e2128a62a124ed6a1a0d726b441a35ada
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. One prominent link, 'https://ttraff.me/wix?keyword=perimeter+of+a+right+triangle+worksheet', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The presence of numerous links and the redirection to known malicious infrastructure strongly indicate a phishing or scam attempt.

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.me/wix?keyword=perimeter+of+a+right+triangle+worksheet
    • http://files.southsidebrewing.net/uploads/1/3/1/4/131453208/7557827.pdf
    • http://dufoxepi.alccnj.org/uploads/1/3/0/7/130776824/vimatanidud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6354af5d-3f82-47ff-8457-662f1616d3d1.filesusr.com/ugd/e643da_552f29e52a2b4c07bddd646d0dfe80e2.pdf?index=true
    • https://7608fbf3-0031-4c19-8f76-94419b294b6b.filesusr.com/ugd/8e6e76_87457d9a5c514557a79f97c8902e1a20.pdf?index=true
    • https://ca8a597e-844d-4826-9131-419d8c62356f.filesusr.com/ugd/7d1dc9_751abbf220e546999e41625b76862ae8.pdf?index=true
    • https://519e0b21-74ce-457b-8432-79d97142d7b8.filesusr.com/ugd/529dbf_5313f0437064458b89ea6d5b9215eac0.pdf?index=true
    • https://c7e4e111-dc0b-44dc-8429-80be0be9c808.filesusr.com/ugd/b463f2_506b39de34c14719bf0fcfeb1c524188.pdf?index=true
    • https://7779d259-2020-4876-8ff3-d46c2b4fb4b3.filesusr.com/ugd/ab922d_69a2c029697f4786915394b34627070f.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/block_site_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/37344675784.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5502/files/teacher_s_guide_grade_6_quarter_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4743/files/thanksgiving_cloze_activity_answers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c00.bin
9ca97362de86f9ca71755c79abf3629b6b59d3077f0f2c16d0eb5b6a1aae23e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C00 5340 bytes
font_01_sfnt_off00006e10.bin
32a9b46826f97cb68dd0ab6a15f6a1065fe55175f86ad013a93072ffaee4bc0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E10 10036 bytes
font_02_sfnt_off0000909d.bin
6ae61237400d33412f60a3aa131962030608fd104cae84d4ea987596d4ae31e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x909D 16196 bytes

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