Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b918f4ee3da41f…

MALICIOUS

PDF

49.8 KB Created: 2020-11-05 08:34:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cf23162516b49141823f3f5e57290165 SHA-1: ddd88bbefe619ef637d8d25a7c64d9f57f09676c SHA-256: e7b918f4ee3da41f652f7c8ba6150e8228efbd88d897677cb2a3e5d455850544
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://ttraff.me/123?keyword=non+school+blocked+games In PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/wemubedufigomemikis.pdfIn PDF document text
    • https://sumijiluwovoj.weebly.com/uploads/1/3/4/2/134266387/9239535.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/gorogogekiju.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/2db458c6.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/vigajig.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://uploads.strikinglycdn.com/files/415c2df4-4f8e-464f-ba5a-b62f902cccbc/arachne_soul_eater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6087787-08ad-4dbb-970d-ce23dc63d661/fixasusidukak.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/swimmer_s_shoulder_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75046448-3fd5-48bf-9344-bbaf4306c3d0/83889008575.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/4th_and_goal_2013_football.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/60163095829.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EC 5092 bytes
SHA-256: 85a5178742ca8c98c3a78cac79b2e46611ce8272f4bad746bd60590606f69941
font_01_sfnt_off00008806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8806 10612 bytes
SHA-256: cf1174cf2fff4632b409f6d17156c3b5abe0dc5127f37c8631044ecf06cdf12f
font_02_sfnt_off0000ac47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC47 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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