Malicious PDF — malware analysis report

Static analysis result for SHA-256 851ab2aff2b28ce5…

MALICIOUS

PDF

67.4 KB Created: 2020-11-06 00:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b3866155cf31f5f5d92923238c845bf3 SHA-1: 76a42783a84610943c6668de928a7dc708e8141e SHA-256: 851ab2aff2b28ce5160d652b52421adc51ffbfd8b127f119cd5bfed45b4207be
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and a heuristic firing indicates a link farm structure, suggesting it's part of a phishing or scam campaign. The primary URL points to a lure for free game accounts, likely a pretext to redirect users to malicious content hosted on the linked PDF. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=accounts+for+fortnite+ps4+for+free PDF link annotation
    • https://bubudatitiga.weebly.com/uploads/1/3/4/3/134308982/savunisaribud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5f95146deb7e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/cours_de_l_automate_programmable_industriel.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/jared_padalecki_age_in_2005.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/53432563939.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/2005_pontiac_grand_prix_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/atal_pension_yojana_in_hindi_sbi.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/rift_class_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/53479013910.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7412 20992 bytes
SHA-256: 8730c9662ac54740fce7024355e2cdbb75c6b64efcfb3a42e1b7784746d267ce
font_01_sfnt_off0000b698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB698 4844 bytes
SHA-256: a9771959888a5c171a7aec9694941129953a071e2ed1423283414f947793486d
font_02_sfnt_off0000c733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 10536 bytes
SHA-256: 0f28a4ef87fa806a1538239217a984ee5965de9fb6d292edd292bf43e1bd05e8
font_03_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 16092 bytes
SHA-256: c0a2658b41d639f606eba7091e87e8bd42a81d8ac063310e149400b84daa429e

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