Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35e31659abc4518…

MALICIOUS

PDF

48.2 KB Created: 2020-08-31 07:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d86cbf6e704c92d3379c1bec761f5745 SHA-1: 46c323d66a4fcc2c4e40b7640d70ee4d81e9ec3a SHA-256: b35e31659abc451861ce9de6b314c5a8d096075d85905c694d3b188ec63ad11c
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same lure text and the malicious URL, indicating an attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing or redirection 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/wix?keyword=new+year%2527s+day+taylor+swift+piano
    • https://static.usrfiles.com/ugd/dd6616_ce23f80951ad4f2f90705828804795d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_89d5308107374ac8927f28b604a1b444.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_b6d6e858f972488191efd251b46e45c1.pdf
    • https://cdn.shopify.com/s/files/1/0428/2282/8198/files/guwufufefixiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/all_maths_formulas_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/7936/7845/files/baldomero_lillo_la_compuerta_numero_12.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5376/files/increasingly_buff_spongebob_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/81268403139.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/46532541515.pdf
    • https://cdn.shopify.com/s/files/1/0440/7921/8840/files/effects_of_tardiness_among_students.pdf
    • https://cdn.shopify.com/s/files/1/0431/2252/4326/files/caracteristicas_del_modelo_neoliberal.pdf
    • https://static.usrfiles.com/ugd/7598fa_0829730c0c284959a30b7bbba637fd1b.pdf
    • https://static.usrfiles.com/ugd/93971e_cd63e680f6a940289d4ecc66ce72a973.pdf
    • https://static.usrfiles.com/ugd/0e2875_4b47230953964734bc8ad05bd134e572.pdf
    • https://static.usrfiles.com/ugd/9b33c5_e9773efeb91447bbb73bc836149e3278.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058b3.bin
433c39af9719a8759bad9b4006ef6ca7e95c2bfc8344e3cdc9f1bde5a0c3ce96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B3 3548 bytes
font_01_sfnt_off0000655e.bin
524ef78e054b2304e0cc7a4921f24123947ed1e894604a856ed87395e9d12d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655E 5020 bytes
font_02_sfnt_off0000769d.bin
89f6374d8b69d9521a12bf11aacb0191862488dcc7887d8b427e67af506ca298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769D 14792 bytes
font_03_sfnt_off0000a518.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA518 4324 bytes

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