Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c9d1438209b4a7…

MALICIOUS

PDF

69.9 KB Created: 2020-11-21 04:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c810b3a43a59ff5719b4c57bd74647d1 SHA-1: 839966ea10a454f0b474a99532183b1af6f3fa08 SHA-256: 40c9d1438209b4a7922c714e9bb855371c41eb86a6bcab7af9eab35e79f83bcd
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. The embedded URLs, such as 'https://ggtraff.ru/aws?utm_term=myanmar+subtitle+movies++apk', are likely used to direct users to malicious content. The document's structure suggests it's part of a campaign to distribute malware or phishing content through a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=myanmar+subtitle+movies++apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_5fae19a038235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498801/normal_5fb55d3d70fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_5fa4ed8c6d4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_5fb3c9a038e34.pdfIn PDF document text
    • https://bufetokarad.weebly.com/uploads/1/3/4/0/134096279/jivodo.pdfIn PDF document text
    • https://rogusedi.weebly.com/uploads/1/3/4/4/134433103/5286943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416502/normal_5f9ea3b8728d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469101/normal_5fa3bd788bee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_5fa4f726c46d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xukonakefules/netacad_chapter_2_answers_v6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e36d36-7419-4913-b65c-0d8864fd4805/4732681304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d38f17-7b84-4628-90d0-f7ba79d0fe88/73056405204.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
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD55 5216 bytes
SHA-256: c093f46bf6ecaad74639ff30483cdae3ea7b6c72fbd09b3f8812bca9d55fcea4
font_01_sfnt_off0000bf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF01 10364 bytes
SHA-256: 3cab1b4a53c0256a465419c393e655b67990272c0f96af3dfd7055531b29600b
font_02_sfnt_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_03_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 8328 bytes
SHA-256: 3f043bc618bf2b74f35794f30cb643c0960d01b73376f1755bef922dd0703b60

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