Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed0d7291bdce3ad…

MALICIOUS

PDF

49.2 KB Created: 2020-08-08 21:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b91c8b550b5b3fe47de1cd9a09c31abe SHA-1: a9ce524be0c628bc88257af2353c76bccabd7021 SHA-256: aed0d7291bdce3ad6c46c6a83335c32599e41ff3f1be1b44086e83f11833338b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the presence of a large number of external PDF links, indicating a link farm. The document body, though partially corrupted, contains text related to 'Airtel postpaid plans delhi pdf' and mentions 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=airtel+postpaid+plans+delhi+pdf
    • http://files.nachomamanc.com/uploads/1/3/0/9/130969077/0ff97b8.pdf
    • http://files.osborneranch.com/uploads/1/3/0/9/130968960/rupetom.pdf
    • http://files.marymartinharper.com/uploads/1/3/2/7/132741535/mixatojakatofer_jajodisa_vawokibexusef.pdf
    • http://files.bdgtrainingconsultancy.co.uk/uploads/1/3/1/6/131606537/nupuv.pdf
    • http://files.traumarecoverybc.com/uploads/1/3/0/8/130874250/dae0ca5c657.pdf
    • https://cdn.shopify.com/s/files/1/0433/6559/7342/files/cfa_level_1_book_2_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/78952710046.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1373/files/fafobub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8272/7067/files/xopokonirumupu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/game_embed_codes.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9380/files/fesazavugepimigokediv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9134/6079/files/certificado_mdico_escolar.pdf
    • https://cdn.shopify.com/s/files/1/0433/1667/4713/files/energy_australia_price_fact_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/arbitrage_trading.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082c1.bin
a4236abfd2f85012c253853a89a5a629f069174970eeb0fa52a75db52e39bdad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C1 5120 bytes
font_01_sfnt_off00009420.bin
ad9d7ddb98201faa93118e27f8cc88908ff0bd99897ee1e520c7e4e6158eac3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9420 10428 bytes

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