Malicious PDF — malware analysis report

Static analysis result for SHA-256 876fa932b8becc5d…

MALICIOUS

PDF

42.7 KB Created: 2020-10-27 14:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1424a2141ca2e4515feb07ceda19287f SHA-1: bb2568d4ab0cf57123c96f22c8b80a67c3d056b7 SHA-256: 876fa932b8becc5da709e74a49d05091bf9635b8d9d135f40c19898e12b8d833
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL and the PDF_SEO_LINK_FARM heuristic indicate an attempt to drive traffic to potentially harmful sites. No scripts were extracted, but the overall structure suggests a phishing or redirection attempt.

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/123?keyword=qingdao+huangdao+zip+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5f942ba8e613e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f8b091d55eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_5f8d704289bcd.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/08fd7792bc816.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/juzepujazomiduvitak.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/1/0495/6310/7480/files/9th_grade_english_reading_comprehension_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4471/8760/files/indicaciones_de_hemodialisis_de_urgencia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0604/9442/files/21766745816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8366/9412/files/10.5_practice_b_geometry_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2936/4899/files/irradiated_blood_transfusion_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2446/8126/files/betexelibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1088/2716/files/zafegemutizidinabim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9929/4363/files/jingle_bells_sheet_music_easy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/euripides_the_bacchae.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/5954/2947/files/female_vegan_bodybuilding_meal_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/kususax.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/wugivu.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_off00006919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6919 5140 bytes
SHA-256: 9e8d1724a53eaa5125aea00fffe07a2b3619fad3f88b7a91a615f9fa9acbd2d5
font_01_sfnt_off00007a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A91 10376 bytes
SHA-256: 0c2987c8e3364e330f87a3fb5b9a88b4bc16dea59dc8130886fe2d7586a880d0

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