Malicious PDF — malware analysis report

Static analysis result for SHA-256 77eff287cbfcfab9…

MALICIOUS

PDF

53.7 KB Created: 2020-08-14 02:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db417ff5706117025bdbd2e2f3d3b94f SHA-1: ec9633c960224f131cbf5e9f01243270b7752977 SHA-256: 77eff287cbfcfab947297f72c35161f3ed04aac7f158ac2a27c668fdf5b067e8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites.

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=learning+robotic+process+automation+uipath+pdf
    • http://tikufovut.kippcourage.com/uploads/1/3/0/9/130969754/warideneb.pdf
    • http://ruzuxuxo.ahbuildingservices.com/uploads/1/3/0/7/130740051/5fae8730b40.pdf
    • http://files.dallingranch.com/uploads/1/3/1/4/131454549/ziwunulovimezikofo.pdf
    • http://sunegene.alusoare.com/uploads/1/3/0/8/130813403/9269409.pdf
    • http://files.eccentricpersonas.com/uploads/1/3/2/3/132302749/vubusuduki.pdf
    • https://cdn.shopify.com/s/files/1/0436/8374/1849/files/vivomugorajawininonokixeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/7520/6294/files/kreg_pocket_hole_jig_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11147191401.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/54481034190.pdf
    • https://cdn.shopify.com/s/files/1/0434/5646/3001/files/schoolboy_q_oxymoron_mp3_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0059/3557/files/97881965117.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/ankylosing_spondylitis_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/65409077460.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4246/files/al_dente_corso_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jezimix.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/72604602975.pdf
    • https://cdn.shopify.com/s/files/1/0445/6860/8927/files/beauty_and_the_beast_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/6th_grade_math_final_exam_with_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084e6.bin
795e4868af3ce3eea353a72c882c3542c62f051a4ee6f0fcdedd83fc8014b731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E6 5500 bytes
font_01_sfnt_off00009763.bin
439dba5831ebf0a2797f34d346d8fa22e0cd81d9a686aa99070e60ea0587f9c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9763 10452 bytes
font_02_sfnt_off0000bb05.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB05 4324 bytes

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