Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0ac6311761e636…

MALICIOUS

PDF

65.5 KB Created: 2020-11-02 18:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ab2e575e41c814e881ee2de69a450806 SHA-1: 7c45c745a51bc6a105e801f557b72795b3d5659e SHA-256: 0a0ac6311761e63665f5c29f4e4061f9ac43284587be71f022a4ef43ac2486c7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link disguised as a background check service, which is a common social engineering tactic to trick users into clicking. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm or redirector setup. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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://gettraff.ru/123?keyword=uber+background+check+california In PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/jizav.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/jolituzoji/chapter_10_study_guide_blood.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/ditaguzeziji.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/72243324715.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/scan_beyblade_burst_turbo_codes_accessory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0655/8886/files/94281469382.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/the_odyssey_worksheet_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/borderline_kiilik_bozukluu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6023/8744/files/rogevepesomub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0746/5380/files/upper_gi_bleed_acg_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/354a611d-dee3-4fa9-90f0-d1f3af798a65/fafupogut.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/scarborough_dump_hours_of_operation.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/lake_erie_open_water_marine_forecast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77f310d-2909-4c5f-8780-b3ad559ebb89/axl_tamil_dubbed_movie_isaimini.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_off0000b3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A3 5104 bytes
SHA-256: cda9aa0e63f50b73706597e8d6cc819374919aa02b661d9b0ef574da1d227edc
font_01_sfnt_off0000c4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E9 11324 bytes
SHA-256: 0429c3f3be94ecdabf39323ec6af037d4e5aaa87c60d5181c7f7a045d1c7d9ad
font_02_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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