Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bee61acef22e14c…

MALICIOUS

PDF

43.0 KB Created: 2020-10-26 01:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 97abd597744d4fad75f8276321e7eb3b SHA-1: 92ad8323a7974b7c5746416e4abf69393bdbcec6 SHA-256: 4bee61acef22e14cf986fd9d9db389591c6fe2943073edcb6b61fdaed5d4d096
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to other PDFs, characteristic of a link farm. One of these links, https://gettraff.ru/aws?keyword=calendario+ottobre+2018+da+stampare+pdf, is identified as a malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/aws?keyword=calendario+ottobre+2018+da+stampare+pdf In PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/gudewozubajupoloj.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/2840268.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/0708d28695305f.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/pumupipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/susopuzupure/67814933635.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/53924896430.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/neumonia_pediatria_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/alphabet_coloring_book_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/calidad_de_vida_y_salud_mental.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0213/7240/files/6519407111.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5518/3537/files/com.google.android.material.button.material_button_toggle_group.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccffcbff-e67a-42cd-90cc-511338a4c1de/sadipidufuxejibodoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa3483c-4b62-402f-9290-17631e6f1f07/pomofogekuraximukazolemo.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/limpeza_21_dias_arcanjo_miguel.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/ancient_egyptian_hieroglyphics_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/nuzalusipumikot.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/39445005950.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/23231549414.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/suzinexalapupugufif.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/indian_air_force_exam_paper.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5911 5656 bytes
SHA-256: 7f1dcb2703f7fbdf5b82dc8875620592edf42fda7949432894e471e6ef03c468
font_01_sfnt_off00006c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C32 10936 bytes
SHA-256: 6c1790b292bb0bd6e4fba1f8b9a4f73858b1818e5cd68c25384809c398480f98
font_02_sfnt_off0000905b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x905B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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