Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85411bb9403fc4a…

MALICIOUS

PDF

36.0 KB Created: 2020-10-15 15:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e0af3b6afb57afc22214d1e9a2f2634f SHA-1: e2117cb6d7aaf85a08da52c188766b1447590b1f SHA-256: d85411bb9403fc4aaa36fca25731db459624b2d9663da3ba615fe72329e07eff
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One of these links, https://ggtraff.ru/strik?keyword=nextplus+apk+download+free, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious content, likely as part of a phishing campaign.

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/strik?keyword=nextplus+apk+download+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f876508d7b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f872859471da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f872b64cc246.pdfIn PDF document text
    • https://site-1038303.mozfiles.com/files/1038303/780469707.pdfIn PDF document text
    • https://site-1039303.mozfiles.com/files/1039303/64574401127.pdfIn PDF document text
    • https://site-1040286.mozfiles.com/files/1040286/gepomopidovadaxupir.pdfIn PDF document text
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/teragikim.pdfIn PDF document text
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/8465739.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/1/0435/1275/8426/files/molecules_of_life_kuriyan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4630/0576/files/88542858639.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8998/3643/files/improper_fractions_to_mixed_numbers_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2409/6669/files/go_math_second_grade_chapter_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29dde514-64e9-418d-ba71-13e2c82d9b35/natunifibasojexuzofaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aec3ab6-405e-4c30-984d-42704ba5d34b/42819764063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16bcdf7-7597-4bf1-ac23-91432b4f849d/89729283681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2b6ea4-5a06-46ed-b5df-1537c15f66db/57720444169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ee8ffd-698f-4d65-b5df-5f71a039daec/10889853344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0774b674-fc25-4ded-9845-ac6c64b434d7/74666395994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1301d04c-69ce-49e2-a49f-88fa2b42041c/42041547451.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_off00004f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1D 5228 bytes
SHA-256: f6baa690e27b8b9625b45a40f6ccaafb87e5f765e22b9b89cb7a2771da054a35
font_01_sfnt_off00006110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6110 9896 bytes
SHA-256: 5563d775b54291d420159251bd3ca4fe22c3c37da159941635ecc96baab2e405

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