Malicious PDF — malware analysis report

Static analysis result for SHA-256 681035333a56b630…

MALICIOUS

PDF

34.7 KB Created: 2020-08-16 14:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c82e6da00c8eef730ea1ea4fe054dd44 SHA-1: e53fdcbfa7ee716a3168e310627b7c35200120c8 SHA-256: 681035333a56b6302a6313dd8bc31b4814f4fd326d6ac252245307bf1ee5ad9c
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, identified as a link farm, with one specifically pointing to known malicious redirector infrastructure. The document body itself is heavily obfuscated but contains the same malicious URL. The primary attack pattern appears to be SEO manipulation or redirection to malicious content, rather than direct execution of a payload from the PDF itself.

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=barbarians+clash+royale+apk
    • http://files.bradyedc.com/uploads/1/3/1/3/131383949/19639d9d5451a.pdf
    • http://files.sprucetopsmn.com/uploads/1/3/0/7/130739571/gusezunusuzeme_pitewozeluxobo_texutefiwimat.pdf
    • http://files.hijoeselectronics.com/uploads/1/3/0/7/130739204/bubawek.pdf
    • http://degadoza.newlifecitychurch.org/uploads/1/3/0/9/130969204/demubofug-vaxunisune-badomane.pdf
    • http://files.columbiasoch.com/uploads/1/3/0/7/130775413/2141000.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6256/5795/files/social_worker_cover_letter_sample_no_experience.pdf
    • https://cdn.shopify.com/s/files/1/0447/4827/5863/files/buzifosegomobipupifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/calligraphy_alphabet_easy.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1318/files/21577950393.pdf
    • https://cdn.shopify.com/s/files/1/0429/4790/3644/files/sales_interview_questions_and_answers_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3093/7751/files/lizogukojipimagirafada.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6635/files/minayo_pesquisa_qualitativa_livro.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/epileptic_seizure.pdf
    • https://cdn.shopify.com/s/files/1/0432/9137/7828/files/12905482184.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4470/files/gibarokosujebejurenin.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/gokokurituxaxudexuniw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2818/files/91125928140.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/lofabojejusavagalamuwup.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_off00004a14.bin
d72a82fd1922b0f6dacfec704e73fc66b30d43bf8cec045c07bc1023fd83bc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A14 5376 bytes
font_01_sfnt_off00005c50.bin
f4eb7510a7537b45afb2f668fff8e511db78862f8993af1bfece7f353f83fec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C50 9820 bytes

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