Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e93ea87aa125625…

MALICIOUS

PDF

61.7 KB Created: 2020-08-30 20:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f0a1a150ca69e5a69672879e37a1883 SHA-1: 5263f67c1dbab2f8196fdf3d250b2d9ea2c18a8e SHA-256: 5e93ea87aa12562504ea374831016a6b45993605cf605c843adfe7c8a2e030ee
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 a redirector service. The primary malicious URL identified is ttraff.com, which is known for malicious redirector activity. The document body, though heavily obfuscated, contains text suggesting it is a worksheet answer key, a common lure for phishing or malware delivery.

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/wix?keyword=principles+of+ecology+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/98857b_147bb3e3bb524302b123974628f46ca1.pdf
    • https://static.usrfiles.com/ugd/8127dd_09f7a654d5034628be931d9ec0de9025.pdf
    • https://static.usrfiles.com/ugd/accd1f_c57d4dbc182b422791b1c1cd6e78e951.pdf
    • https://static.usrfiles.com/ugd/77d535_c2839416cb1041c694038dc5244a7bb3.pdf
    • https://static.usrfiles.com/ugd/7f46b5_3eb7323ce7184974afae9628532343ed.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/tefopuronilovugusevewog.pdf
    • https://cdn.shopify.com/s/files/1/0434/7504/2457/files/84445338440.pdf
    • https://cdn.shopify.com/s/files/1/0434/8067/8557/files/fowubibazeseratedif.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/80853271984.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5764/files/natojumofopanilej.pdf
    • https://static.usrfiles.com/ugd/b8c837_8346e753212544c4a081fe7a97d82b1e.pdf
    • https://static.usrfiles.com/ugd/738632_b3d7c1d85c354ff58acb43043956cf4a.pdf
    • https://static.usrfiles.com/ugd/ae15ca_667f944fb7e04826891c91451ac3eb06.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f0d6ebb48224e0291c738e83f12f25a.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/44302165246.pdf
    • https://cdn.shopify.com/s/files/1/0446/4944/7587/files/interlocking_bricks_manufacturing_process.pdf
    • https://cdn.shopify.com/s/files/1/0434/3532/7653/files/adjective_adverb_and_noun_clauses_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/31886960602.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/quizas_quizas_quizas_piano_sheet_music.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_off0000b20a.bin
75783cfcffbf8f2b63e7f766edd3b46f43d5cadcaf782f494981b52a591419e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB20A 5536 bytes
font_01_sfnt_off0000c4e9.bin
57bef821cf07b97bc4d1d95dc7b40a3c7e2d60d5cf2b9279fad532ec894c8a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E9 10660 bytes

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