Malicious PDF — malware analysis report

Static analysis result for SHA-256 10eb197f753d0728…

MALICIOUS

PDF

42.8 KB Created: 2020-08-25 12:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e74001a6b466c16c52c9f46bdc9a4e87 SHA-1: 0be6a5ad5aa0a08944188ec0f60cac4ba8b8481a SHA-256: 10eb197f753d0728db3573f8f9bc90f1d6ba4dda0cfd11b2f5c70376e993a157
202 Risk Score

Malware Insights

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

The PDF contains a lure for an advance-fee scam, presenting a fake download link for antivirus software. It also includes a mass external PDF link farm, with one URL pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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
  • 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.com/pify?keyword=avira+antivirus+for+pc+latest+version
    • http://fuwil.soarohio.org/uploads/1/3/0/8/130874113/jabaxosotelibo-mavitudul-volagexijufor.pdf
    • http://vogiped.cateyosborne.com/uploads/1/3/1/4/131453416/c21274172a06e95.pdf
    • http://files.grymesmcleod.org/uploads/1/3/1/1/131163980/sefikuvuzir.pdf
    • http://files.adventmoravianbethlehem.org/uploads/1/3/1/6/131607269/156399434.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/badland_brawl_apkmonk.pdf
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/jolas.pdf
    • https://cdn.shopify.com/s/files/1/0430/4276/7001/files/siwaxiw.pdf
    • https://cdn.shopify.com/s/files/1/0452/0319/4007/files/kamarinasojomudaruliga.pdf
    • https://cdn.shopify.com/s/files/1/0436/4982/6969/files/butterfly_valve_tozen.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/waukesha_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/real_address_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/xawuvepagewuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/number_1_worksheets_for_pre_k.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006288.bin
abfeab71225d7155dc60a4551cc0faf365ef38555b68bc721cfe525b8ac6bd52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6288 5060 bytes
font_01_sfnt_off000073d2.bin
48437cd12d0112e8b0e5f5b304294fd920cfc10e0d6bb6787af710620a012482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D2 13584 bytes

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