Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e4d77a118aefae…

MALICIOUS

PDF

38.3 KB Created: 2020-08-12 13:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3159387cf0c676705086053d27b3c0e2 SHA-1: 41badce5cea1ad27a4d277329ffc4e7219a6d2de SHA-256: 66e4d77a118aefaec617634fc7b2fff55bbd97c01a5c58843ffdf26add1d2522
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 external resources disguised as academic downloads. The primary link, 'https://ttraff.com/pify?keyword=neela+bakore+biology+notes+pdf+free+download', suggests a lure for free educational materials, while the numerous other links likely serve to distribute further malicious content or engage in SEO manipulation. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or content-distribution attack.

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.com/pify?keyword=neela+bakore+biology+notes+pdf+free+download
    • http://files.anniesresalefortheworld.org/uploads/1/3/2/6/132682335/jadeginududi.pdf
    • http://luvisob.ruthartistrydecor.com/uploads/1/3/1/4/131454859/fuxegitug.pdf
    • http://files.atlantadentalanesthesia.com/uploads/1/3/1/4/131455883/najikenusapijevofifu.pdf
    • http://puzezaxif.culturempls.com/uploads/1/3/1/4/131454106/xilumawudozada.pdf
    • http://files.risingtimes.info/uploads/1/3/2/6/132696304/42ba0badee5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/9703/8756/files/96470388942.pdf
    • https://cdn.shopify.com/s/files/1/0440/6296/5912/files/15495355874.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/sense_and_antisense_strands_of_dna.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/xuxokebisezu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7247/files/67749573444.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/74694215427.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/binomios_con_termino_comun_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/38829612849.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/atos_dos_apstolos_estudo_bblico_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/98161460632.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4470/files/ielts_readings.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/12257026579.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2661/files/81019243784.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0960/files/zadulidokelozenofalusaso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c13.bin
987ffbec58d600b26bf7b8cf2c834f7d05b6d7b6543f877fd7fa9bde4c039e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C13 5364 bytes
font_01_sfnt_off00005e73.bin
478d407309bdb3c517f7f17bb66134853c2a86a0e6d8d0dce81ae6f9cafada2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E73 9268 bytes
font_02_sfnt_off00007dd8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD8 4324 bytes

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