Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c79b78225e2b6f…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 01:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea2967b642eccfc6991739e6f43aaba4 SHA-1: 2f1352d3f7fa215d0fdfb10db7e40ca67fcb055b SHA-256: 28c79b78225e2b6f78d73187bde506ed9c07b76c01626bfe56d982388d0abe69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious due to its extensive use of external links, forming a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which likely serves as a gateway to malicious content. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting a phishing or malware distribution 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.com/pify?keyword=cellsentials+pdf+espa%25C3%25B1ol
    • http://files.framemysore.org/uploads/1/3/1/3/131384789/7349004.pdf
    • http://files.seriousplayworks.net/uploads/1/3/1/4/131407369/gepelijutidetufekas.pdf
    • http://files.silverstreetlutheranchurch.com/uploads/1/3/1/3/131398268/losot.pdf
    • http://nikoti.lakelandcommunity.org/uploads/1/3/2/6/132682051/zaputafeja.pdf
    • http://files.1966mhs.com/uploads/1/3/1/3/131380258/aae1f2bb820c.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0823/files/word_to_converter_app_free_download_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/8577/4502/files/99290522948.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/zimejikijedog.pdf
    • https://cdn.shopify.com/s/files/1/0428/2315/5878/files/critical_thinking_skills_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/30444493198.pdf
    • https://cdn.shopify.com/s/files/1/0430/3391/9645/files/jivikojidugaligasole.pdf
    • https://cdn.shopify.com/s/files/1/0436/0863/7602/files/alzheimer_genetica.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/numenera_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/vukafedemakumogusarotagas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3253/files/anastasia_once_upon_a_december_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4355/files/bekizozurutupikede.pdf
    • https://cdn.shopify.com/s/files/1/0439/0017/4504/files/vatike.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/25111171343.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/baghouse_filter_working_principle.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_off00006c8b.bin
289edae2f1248188d709c3320b79e9e93fc300e4f7aadb9484323b71733a7cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8B 5056 bytes
font_01_sfnt_off00007d89.bin
d7f548afabee9e8df054d035f633e1416811d139dce23e7e16d475f8d95cf2e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D89 10672 bytes

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