Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b28da821c45c719…

MALICIOUS

PDF

62.6 KB Created: 2020-07-24 21:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85bc0d33eaf403d5dad2a5ff510250e9 SHA-1: 0e0c07352b050ae42999cf25f434669dd470704a SHA-256: 0b28da821c45c71904e5ce3d841ab8d6be1d9cf7d66326d5ba833858f48499d1
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to a link farm, and one critical link to a known malicious redirector. The document's content and heuristics indicate it's a lure for an advance-fee scam or a fake invoice, designed to trick users into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.ru/pify?keyword=google+sheets+query+remove+duplicates
    • http://files.southashlandumc.org/uploads/1/3/1/3/131378932/vafezijugotaf.pdf
    • http://files.debbietuepah.com/uploads/1/3/0/7/130739069/1593063.pdf
    • http://files.mybridgefilms.com/uploads/1/3/0/7/130775014/jegudinem.pdf
    • http://files.magicalhomesneardisney.com/uploads/1/3/0/8/130814855/3332160.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9610/4348/files/vamiluzuzufugipapef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/jovil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/78710394132.pdf
    • https://cdn.shopify.com/s/files/1/0429/5698/0377/files/26396706688.pdf
    • https://cdn.shopify.com/s/files/1/0437/5481/5640/files/12766837318.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/wisofeva.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/xijolorafoworoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/dakepuniropixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/vijojanufinarisegakeze.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4027/files/popexapebojopabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7827/8563/files/fexipanupotepisakogi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa95.bin
b6e716d97922e705e5b7022f15cefd0c7a66b353372933785562afc5068bf68e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA95 5580 bytes
font_01_sfnt_off0000bd91.bin
b90db19c2f777b7dc0b707ba2317d3983e4e68eda5e0f6ca056e06946e48e157		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD91 2484 bytes
font_02_sfnt_off0000c82f.bin
de48a6aa2662adfc5a55e2400e6114686408c117834d23549db6d21475834370		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 10608 bytes

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