Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c716717791336a…

MALICIOUS

PDF

83.7 KB Created: 2020-08-31 18:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d06560eb5194cd16e594d684c7814e11 SHA-1: dc2c492bf37e7e53f5fbc210b57a2d4946104ec6 SHA-256: a2c716717791336ab06c32dbc766bb7881c1cde1467f102f5a96be4dfb6a516a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources.

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=aaranya+kaandam+movie+songs++masstamilan
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/calculating_volume_worksheet_works_answers.pdf
    • https://cdn.shopify.com/s/files/1/0444/8750/8135/files/belajar_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/6345/9496/files/tigorigezimidivujitudol.pdf
    • https://static.usrfiles.com/ugd/b8c837_c70ae301112d4537b646ff22c82535f0.pdf
    • https://static.usrfiles.com/ugd/cafc24_6a6bb16e4df64761b513f4040ce24aaa.pdf
    • https://static.usrfiles.com/ugd/d1d005_be1907d562384e46828df78522f4f726.pdf
    • https://static.usrfiles.com/ugd/704566_3d31d7ed01d0410b91451e5f2f6d9ebc.pdf
    • https://static.usrfiles.com/ugd/9b5f63_61123d4d78f44f7a8d22df141120c31d.pdf
    • https://cdn.shopify.com/s/files/1/0459/8684/0743/files/cancionero_cristiano_con_acordes_de_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0428/8203/9964/files/chava_book_file_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/6332/7385/files/tally_erp_9_voucher_entry.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/dizewa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/58878739178.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/
    • https://static.usrfiles.com/ugd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef2.bin
349f4fb6d632c07489f7f70b033dbb15a8c9230651a509c24c2e96314a65f678
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 5360 bytes
font_01_sfnt_off0001112b.bin
2ef085ad27d9a874e6dbc1655db79c6de58f46ce0726fa2d9479d27712743274
pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 15640 bytes