Malicious PDF — malware analysis report

Static analysis result for SHA-256 5705a8ebf634fc17…

MALICIOUS

PDF

44.2 KB Created: 2020-10-21 06:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f15ca3002c17daa017f91d830b98cdbe SHA-1: 4ba47ab10e96103b39929527c59b2f94395be1b8 SHA-256: 5705a8ebf634fc176db272b4f2bc242549092d2975e333bbed687deff9f263c2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/pify?keyword=sunbeam+breadmaker+model+5891+instruction+manual'. This URL is presented within the document body as a 'Sunbeam breadmaker model 5891 instruction manual', indicating a social engineering lure. The presence of numerous external PDF links, many pointing to S3 buckets with numeric slugs, suggests a link farm or SEO poisoning tactic to distribute malicious content. 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://ttraff.me/pify?keyword=sunbeam+breadmaker+model+5891+instruction+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8accd03d821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_5f8f544e5de97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8779f7f3e2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5f87e3f55b731.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/senesanafis-gupukasotere-melusebi.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/joloxomekofuvoli.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/fogexa_tileroxobemoji_samedirunezig.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/kogedugutisizo.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/e62982a91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadovu/23031151837.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/91151944244.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/novolamoxusutadiduxada.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/70606929779.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/ccrt_scholarship_form_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/belajar_adobe_premiere_pro_cc_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/pisciculture_hors_sol_au_cameroun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5251/4979/files/amway_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6109/1221/files/professors_job_solution_2020_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9692/3040/files/lupus_nephritis_guidelines_acr_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4202/7675/files/pufexepasinugomoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/xutowamonodowadomizi.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/louwers_auditing_and_assurance_services.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/amazon_brand_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/30265951062.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/78731876979.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A57 5916 bytes
SHA-256: 88f1f5a3cb14cffb38205e68edec535e3566b4eab28588810483ed925f07e6d6
font_01_sfnt_off00007e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E61 10388 bytes
SHA-256: dc6dff7c1218dd66a6eea2a07e16588fe5f4b5bffadef9792cb1fd90ad4a8d11

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