Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3974f98cf7fd57…

MALICIOUS

PDF

49.4 KB Created: 2020-08-11 23:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85a09e845a42fda3b4a933a7949214ff SHA-1: 7f79bc9fca8814f6318dcf4a8bd41b2182057297 SHA-256: 6f3974f98cf7fd57d8244d123b1438226d54cc13d3ccd9288e227afac610ac24
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 link farm designed to improve search engine rankings. One critical heuristic indicates a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Tcs ninja aptitude questions and answers pdf 2020', suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of 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://ttraff.cc/pify?keyword=tcs+ninja+aptitude+questions+and+answers+pdf+2020
    • http://files.maronianinsurance.com/uploads/1/3/2/6/132695832/defurer.pdf
    • http://files.jaibaidell.com/uploads/1/3/1/3/131383977/9e43b4d83f782b.pdf
    • http://kiluw.lisakalma.com/uploads/1/3/1/3/131384169/sikizori_palaluxagor_zoniropisado.pdf
    • http://files.paulsonisles.com/uploads/1/3/1/3/131380733/ziloziguwavupik-dakefetiganeso-nomamugugina-mebamud.pdf
    • http://ruwavit.rogueartisanfoods.com/uploads/1/3/1/8/131871921/musat-juwipaxow-malofut-wezilivuzenu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6466/3967/files/basic_concepts_of_accounting_mcqs_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/polaris_280_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0431/9153/3725/files/wojumanawosila.pdf
    • https://cdn.shopify.com/s/files/1/0437/7831/0306/files/mikezonapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1559/files/66382558485.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/kalimoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/44929183717.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5225/files/xagupalevupixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4162/0119/files/o_livro_do_desassossego_fernando_pessoa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1551/9912/files/57056070537.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/66772684503.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/fanalekesonavatazosit.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/exalted_autochthon.pdf
    • https://cdn.shopify.com/s/files/1/0435/8032/6051/files/mitochondrial_bioenergetics.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bab.bin
4bb347c13a133d135ece8a9ad07b157f74efbab47c68b4701e57cd0b91559b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAB 5636 bytes
font_01_sfnt_off00007eea.bin
3c6ebe8e913314bb3a6735143be3858aeeed8b0958470d3b0f2712240ceba318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEA 10524 bytes
font_02_sfnt_off0000a2e6.bin
ccf42771811f3bfcfc4881e0ea26c61020463520b77f542a172ed5d532e4d210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E6 16088 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.