Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff0fe117aac3882…

MALICIOUS

PDF

41.4 KB Created: 2020-08-10 08:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7d53afdb12b41389d72bfd690ccd9de SHA-1: 6c8fc40cf803f33e23ef6b182ef50d92252931f2 SHA-256: dff0fe117aac388233370deb31f0cf5f2c82863e80b2b3361e624a15b134ac12
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external sites. One critical heuristic indicates a PDF redirector link to 'ttraff.ru', and another identifies it as a PDF SEO link farm. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=ielts+listening+recent+actual+test+5+pdf', suggesting a lure to download or access further content from this redirector.

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.ru/pify?keyword=ielts+listening+recent+actual+test+5+pdf
    • http://kovovuz.ginandtarnish.com/uploads/1/3/1/6/131607163/jafowavi.pdf
    • http://fufixe.nicojgenes.com/uploads/1/3/1/6/131637257/moteteboxeke.pdf
    • http://gifafev.kellytuckercreates.com/uploads/1/3/2/8/132814930/3852318.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/62172005813.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/wulotelewijiratadatulegis.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/english_academic_writing_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/applied_linear_regression_models_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/3395/9327/files/anomalous_diffusion.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/jimogapexarulatolofufot.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2017/files/wapedumikeragebaxibawur.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7472/files/75792228782.pdf
    • https://cdn.shopify.com/s/files/1/0440/0336/0926/files/ackermann_nurse_call_system.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9494/files/waxolaniwilurevesetud.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6444/files/assam_tet_question_paper_assamese_medium.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/83152375991.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_off00006261.bin
d9602da2dec33ed4bd8e3cefa65b7ed4c70b9f7d88a0db3cf08adc2482c80918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6261 5384 bytes
font_01_sfnt_off000074c9.bin
273ef081bd3506af587f342d580901dbc9c49dde16d28262ba18739a50bc5e05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C9 10520 bytes

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