Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c123e3ed9b6da1…

MALICIOUS

PDF

40.3 KB Created: 2020-08-24 03:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a10926a7faf5f612f5688424041f656e SHA-1: 2108b697d1b5eda2da976643f74a2620f1f8c62a SHA-256: 61c123e3ed9b6da19a72cfaa0e3bf06ad553cf7cc8cbec5a6f7e9ce99e2fb463
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external links, including one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is likely part of the malicious infrastructure. This suggests the document is designed to redirect users to malicious sites.

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=to+be+simple+present+tense+pdf
    • http://feferiku.homedefenseshow.com/uploads/1/3/0/8/130874431/sifesoluke.pdf
    • http://tojozo.chemistryindustry.biz/uploads/1/3/0/8/130814729/bajigalob_xukekilibemuxo_tarebejadudi_pefilekeragelu.pdf
    • http://tisinivog.kiberacreativearts.org/uploads/1/3/0/8/130814347/jodiwagazebugab.pdf
    • http://files.fpcmorganton.org/uploads/1/3/0/7/130738823/warabapoxa.pdf
    • http://larap.never-diet-again.com/uploads/1/3/0/7/130775387/05ee7a4bdce52b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/43374838898.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1417/files/woxevaxejezesojuret.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/junali.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3242/files/icao_annex_14_volume_i.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8701/files/bodyboss_workouts.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/5640051273.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/sebezofofolesonenutaxulab.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/lesukifajuku.pdf
    • https://cdn.shopify.com/s/files/1/0441/1896/6424/files/8_ball_pool_free_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/secrets_aleatha_romig.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0968/files/cbse_sample_papers_for_class_10_2020_with_answer.pdf
    • https://cdn.shopify.com/s/files/1/0430/5177/8202/files/60465383413.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_off0000604c.bin
b8210696c71749145c43d8df8d14b80ddcc6a8d2f069743de9aed51d663411e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604C 5068 bytes
font_01_sfnt_off00007163.bin
ce4f743c119152fecd27a49f02a4912caaa0576d147a2cfe5d84051a4090ef75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7163 10240 bytes

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