Malicious PDF — malware analysis report

Static analysis result for SHA-256 851ac5f6558609c1…

MALICIOUS

PDF

49.0 KB Created: 2020-08-25 04:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b44844c2e08378b97c5e993fb7cb84cc SHA-1: eb6848a2141e17448726dcb461bdbec0e797f865 SHA-256: 851ac5f6558609c14cbdd3f7b1d42589b276ffaae33f089e61c5d5a80b6d16b8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector to 'ttraff.com'. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's purpose is to trick users into clicking these links, likely for financial gain through a scam. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=apache+thrift+vs+grpc+performance
    • http://files.immaculate-concepts.com/uploads/1/3/2/6/132681891/16ea09.pdf
    • http://files.turtlebee.co.uk/uploads/1/3/1/1/131163718/450801.pdf
    • http://files.themiddleshelf.org/uploads/1/3/1/3/131381614/019cbf5a3.pdf
    • http://files.teninabedtheatre.com/uploads/1/3/0/8/130813799/tinidu.pdf
    • http://files.tangonegrofilm.com/uploads/1/3/0/7/130738875/rolubotax-ratatedur-jebiberolusov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9762/8576/files/narasimha_naidu_cinema_songs_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/cuestionario_de_afrontamiento_del_estrs_cae.pdf
    • https://cdn.shopify.com/s/files/1/0439/3231/9899/files/doraemon_story_of_seasons_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/15127636000.pdf
    • https://cdn.shopify.com/s/files/1/0436/9760/2713/files/43664123473.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/fukafoxizixosoxav.pdf
    • https://cdn.shopify.com/s/files/1/0440/6634/1029/files/wixiduwulumefinet.pdf
    • https://cdn.shopify.com/s/files/1/0447/4303/2983/files/generalized_epilepsy_with_febrile_seizures_plus.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1159/files/jizozuligowulolesidebewi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/rosimoxezite.pdf
    • https://cdn.shopify.com/s/files/1/0436/9983/0939/files/jspdf_autotable_codepen.pdf
    • https://cdn.shopify.com/s/files/1/0438/9876/5480/files/pdf_to_word_converter_program_free.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_off0000820d.bin
0c05fe620a2b561937c385b70e0620d95561c800f2801c0b6e7c83bf75efa75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820D 5448 bytes
font_01_sfnt_off0000947d.bin
5a060f58fe56fcde17563e941a9cd671f781413fd3db06fbacafe2e5f364e750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x947D 10120 bytes

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