Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07d09ff2ab259bc…

MALICIOUS

PDF

64.0 KB Created: 2020-10-05 11:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e2a44efd1124485bb23c0e11acd8720f SHA-1: d3d8cb0700af13d143937d418159010ffbd06c98 SHA-256: a07d09ff2ab259bc7b41c467e5a03a6f085254f3df27f04145048c8da5c38215
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or unknown domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body itself contains obfuscated text and URLs, suggesting an attempt to disguise its malicious intent.

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://ggtraff.ru/strik?keyword=lixiviation+cours+pdf In PDF document text
    • http://malowudug.thegmleague.com/uploads/1/3/1/4/131438405/kideg-mesigi.pdfIn PDF document text
    • http://files.complete-service-builds.com/uploads/1/3/1/4/131438312/novatovu.pdfIn PDF document text
    • http://zisafeza.jakyoga.com/uploads/1/3/2/6/132696056/sajaxitar_putibex_mazibogobavufu_fudapasemixa.pdfIn PDF document text
    • http://files.austinmraz.com/uploads/1/3/0/8/130813715/81bb0d27979a5.pdfIn PDF document text
    • https://site-1040244.mozfiles.com/files/1040244/tarelapumabasebes.pdfIn PDF document text
    • https://site-1038739.mozfiles.com/files/1038739/3244946014.pdfIn PDF document text
    • https://site-1037044.mozfiles.com/files/1037044/97602936574.pdfIn PDF document text
    • https://site-1037265.mozfiles.com/files/1037265/kisijugebino.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/43557879082.pdfIn PDF document text
    • https://site-1039503.mozfiles.com/files/1039503/timimelabuvizulepisesaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4711/6197/files/directions_to_asheville_nc_from_marion_va.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/59047425109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8517/5713/files/ortho_glass_splinting_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/the_atom_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5648/2472/files/4.5_aquatic_ecosystems_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D4E 4948 bytes
SHA-256: 6eefe516532440bfef7a3f41c5fc81276da7befc2341c2c141d030251c49e4c6
font_01_sfnt_off0000ae2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2D 9928 bytes
SHA-256: 80d4fbfc2e1a589aa8ab697c7deb73f43912efb2e0a80f554daeddcd2c76db72
font_02_sfnt_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 16100 bytes
SHA-256: e8be64a599b4775abf69106d1ea2a605297721d8ccc8071fb3d67c702b09cfa6
font_03_sfnt_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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