Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa985fab1549a9b5…

MALICIOUS

PDF

45.0 KB Created: 2020-10-16 06:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b4922bed0f623d3cb1cac5fdc6e2f00a SHA-1: e4efcda5b76aed02f20dc554dea03caebda8927b SHA-256: aa985fab1549a9b5d26f4b86a08e7efcb5521f30351c832bf76517ea21ad570c
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 one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text and embedded links suggest a lure to external websites, potentially for phishing or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://ggtraff.ru/wb?keyword=mickey%20y%20sus%20amigos%20juntos%20otra%20navidad%20descargar In PDF document text
    • https://site-1036885.mozfiles.com/files/1036885/13715142299.pdfIn PDF document text
    • https://site-1043291.mozfiles.com/files/1043291/jobosavatutujemebe.pdfIn PDF document text
    • https://site-1040800.mozfiles.com/files/1040800/mizekigejupatopevokezujol.pdfIn PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/sedodojijelujupiniv.pdfIn PDF document text
    • https://site-1043699.mozfiles.com/files/1043699/12_months_of_the_year.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/xelanenemobumukemo.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/6452398.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/jaridezasila-vuxomar-botasejafonovug.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/9500027.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/jezuteredaburex.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://cdn.shopify.com/s/files/1/0438/6055/7974/files/84474674224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3897/7429/files/husqvarna_pressure_washer_3200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7751/5941/files/fun_bright_shower_curtains.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/11504032889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6457/4620/files/jajunixizopelituv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/mavipukerudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9482/9976/files/66525722144.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4373/4182/files/yokoyama_control_transformer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/16447733349.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/7721/4884/files/linear_equations_review_worksheet_algebra_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4122/9470/files/zojumalawuroja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9313/3986/files/92750774206.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_off00005f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F31 5416 bytes
SHA-256: 5478c059ae12de62da722770f7e20a4fb397f306b381357a515aea2cd98b92da
font_01_sfnt_off0000719b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x719B 11216 bytes
SHA-256: ce00638992882af9a4c797c84f24a0f764bcebbcfd906bb0db26563b64192425
font_02_sfnt_off0000965c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x965C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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