Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cab8707900ef0a…

MALICIOUS

PDF

53.2 KB Created: 2020-08-09 06:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a31ba41576f66459e687606f6512bc78 SHA-1: a077aaef761af7b3c3c391aef7b47f75f1f483c2 SHA-256: 10cab8707900ef0ab46f25ca6fdcffbc2fd13d1deba38e54dd934f3255a220f8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise malicious content as a research paper. The ML classifier also strongly indicated maliciousness.

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=makalah+teori+belajar+behaviorisme+pdf
    • http://mixel.thepureprescription.com/uploads/1/3/1/6/131606289/7263308.pdf
    • http://files.octaviocardenas.com/uploads/1/3/1/4/131437603/rekipigezov.pdf
    • http://files.ccfcovid19resources.com/uploads/1/3/1/6/131606011/1061257.pdf
    • http://files.circle-m-consulting-llc.com/uploads/1/3/0/7/130738871/6722053.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0314/9462/files/wupibew.pdf
    • https://cdn.shopify.com/s/files/1/0429/9577/7699/files/35065675342.pdf
    • https://cdn.shopify.com/s/files/1/0429/4397/1484/files/bohemian_rhapsody_partitura.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/56467798647.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/biology_alternative_to_practical_questions.pdf
    • https://cdn.shopify.com/s/files/1/0445/3348/1636/files/post_office_bank_account_opening_form.pdf
    • https://cdn.shopify.com/s/files/1/0436/2131/8818/files/63455111918.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/accounting_equation_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0676/2903/files/difference_between_buddhism_and_jainism.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/zefinuvema.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96512150342.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/43059211489.pdf
    • https://cdn.shopify.com/s/files/1/0435/6194/3199/files/foundations_of_earth_science_8th_edition.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000924f.bin
50d10543198d4974becb0f8be059ac5a3c89e0b8ca36d40ce52fbfe5692fa07d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x924F 5624 bytes
font_01_sfnt_off0000a559.bin
f741f4d36d1b7969f8fd23bcb5d28303bbce03995463377598692fc894e8b272		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA559 10008 bytes

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