Malicious PDF — malware analysis report

Static analysis result for SHA-256 d523a16cfc7a10c2…

MALICIOUS

PDF

33.1 KB Created: 2020-10-29 21:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f3bf056b0cb5d673695c7f233f44cc63 SHA-1: d98c68762205ab8c9f52fb9e30b7a35004ad1a53 SHA-256: d523a16cfc7a10c23a42ed227c3538775cf7f7c8c63aef941be9d26b51fd58de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=topsham+fair+mall+topsham+me In PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/fatafanutojor.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/2333422.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/1/0499/8873/1042/files/sopiwezudemu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2600/1315/files/quantitative_hcg_level_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/jitelazorofepofu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/the_like_switch_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/pifiwasiposowekasu.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/my_hero_academia_movie_download_sub_indo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/mobile_computing_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/2915711610.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6993/1172/files/keto_recipes_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/37123735008.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6934/1341/files/27449185842.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9969/9866/files/iron_horse_armor_vs_gold.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0373/7750/files/valurud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4155/3082/files/the_political_economy_of_social_media.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_off000045f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45F7 5092 bytes
SHA-256: b822103b081826f17c658aacd8e60262dc00117459c8e6c0934797c0c73158bc
font_01_sfnt_off0000571a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x571A 9648 bytes
SHA-256: 2f6f3a776a6cfa205852ad6bc16b95ab7af423fb8018f4303fbd6763fde1577e

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