Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ecf2c23f654681…

MALICIOUS

PDF

38.6 KB Created: 2020-08-29 19:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be5c4856a79193657d222dbab0c49bee SHA-1: 560a6634aa840890e866dddf556df16dffaeff9d SHA-256: 64ecf2c23f654681e12c982d4eca37b49ad01ae9be56d4cb31b7aa00ea50adfb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://ttraff.cc/wix?keyword=encyclopedia+of+things+that+never+were+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a coordinated effort to distribute malicious content or manipulate search results.

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/wix?keyword=encyclopedia+of+things+that+never+were+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_734f0021fc9e4a6093b275344b3cafcb.pdf
    • https://static.usrfiles.com/ugd/b8c837_45ece43204814a668f4ebf9875de5ab5.pdf
    • https://static.usrfiles.com/ugd/b8c837_de70664321e94bd5ae1b2183916fa764.pdf
    • https://static.usrfiles.com/ugd/0e2875_5f634f7e2edb4b56bb36298d1ba16e4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a52eb78221f4fe49f00f493dab48e00.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/bivevova.pdf
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/zukuderab.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/lebefu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6510/files/guideline_value_for_survey_number.pdf
    • https://cdn.shopify.com/s/files/1/0437/3273/0008/files/cool_car_coloring_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2347/files/97545411188.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2821/files/tafofi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/xivugepumogexuva.pdf
    • https://cdn.shopify.com/s/files/1/0434/4542/0188/files/toruf.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/bobcat_753_specs.pdf
    • https://cdn.shopify.com/s/files/1/0428/6090/4604/files/56875260968.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_off000056df.bin
6fa588703ec8c6efb2931a5f609abc1fb368ff81a370305294afee08c23fa41c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56DF 5628 bytes
font_01_sfnt_off00006a1c.bin
6789675fa7b7c689056f9717eaf84ce27648969fa1524421be91f74dd77653f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1C 10304 bytes

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