Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44420783ee38295…

MALICIOUS

PDF

49.1 KB Created: 2020-10-26 06:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7371ba9bbe448ea13994eee24c90e00d SHA-1: 9f6862135feb1f7c76a2173a39e07687cf0af9b6 SHA-256: f44420783ee3829568292f8d875ca6731c293266e93ae2f7c1d37c23f1353c16
154 Risk Score

Malware Insights

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

The PDF contains embedded links, including one to a known malicious redirector at 'https://cctraff.ru/aws?keyword=all+interview+questions+and+answers+analytical+chemistry+pdf'. The document body, though heavily obfuscated, appears to contain text related to interview questions and analytical chemistry, likely a lure to encourage clicks. The presence of numerous other PDF links suggests a link farm or a method to obscure the malicious destination.

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://cctraff.ru/aws?keyword=all+interview+questions+and+answers+analytical+chemistry+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5f8dc3bcb41d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_5f9552098fbc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f963fbfb2e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5f910032cbe52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f86fa2f5617b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4621/3544/files/cuisinart_ice-70_electronic_ice_cream_maker_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4606/3258/files/burawabidifiwumifuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7569/4492/files/79971691720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6747/1551/files/multiple_linear_regression_solved_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1928/8743/files/85761826876.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5496/3109/files/94519303541.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8640/8597/files/36624853278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/4694/1084/files/snaptube_latest_version_2020_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7612/7394/files/72590149964.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9155/0104/files/44351741488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3043f60-8c15-458d-981a-b919ce2069e7/45969424394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd971bc-591f-441d-962f-d714c699e0bf/33347534616.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/bivonoxokeg.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/17571942412.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/gurukalafiluxofekarug.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_off00007f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3D 5764 bytes
SHA-256: 9e19265ab67e303bad4bfde50fef6f6c6421f32199b7143f155bb3745faaeb1c
font_01_sfnt_off000092c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C1 10680 bytes
SHA-256: 0b69368cad5ce1d909edbf4c25d193f29ba92b021564d43021de5345fda2932b

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