Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6be30c9951a4088…

MALICIOUS

PDF

34.0 KB Created: 2020-07-09 06:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1dc948ed55f1edab82a9a94d15ca4b1 SHA-1: 5b2ccb6ea54291687673ac2776b3f084111c932e SHA-256: e6be30c9951a40884df84b570ee97520ed1fadea16e47b6c4d5bf0880bbbb240
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, and another identified a link farm with numerous external PDF links. These findings suggest the document is designed to lead users to potentially harmful sites, likely for SEO spam or to host further malicious content.

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://ttraff.ru/wb?keyword=sundarakanda%20slokas%20in%20tamil%20pdf
    • http://files.vivalavisaa.com/uploads/1/3/1/6/131606231/1008221.pdf
    • http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdf
    • http://files.smokeheadguitars.co.uk/uploads/1/3/1/3/131382320/8321118.pdf
    • http://files.howtorentvacationhomes.com/uploads/1/3/1/6/131606864/6341182.pdf
    • http://files.capefalconkayaks.com/uploads/1/3/1/3/131379223/2717859.pdf
    • http://files.kdhodges.com/uploads/1/3/2/7/132740321/5360778.pdf
    • http://files.bisbeecavehouse.com/uploads/1/3/1/3/131379252/eab8d9.pdf
    • http://files.lkoc.org/uploads/1/3/1/3/131383497/bofepowoj.pdf
    • http://files.gsskids.org/uploads/1/3/0/8/130873973/korunavo.pdf
    • http://files.cedgephotography.com/uploads/1/3/2/6/132695836/pugoz_kijaxupapakuje_minuj_fovekexav.pdf
    • https://nelarig.files.wordpress.com/2020/06/patedub.pdf
    • https://pakelito68704891.files.wordpress.com/2020/06/subazonazupedosunuxigal.pdf
    • https://rapukufaga.files.wordpress.com/2020/07/giwugag.pdf
    • https://lajosesofi.files.wordpress.com/2020/06/52910842778.pdf
    • https://pojolukowo.files.wordpress.com/2020/06/50460035411.pdf
    • https://giposibumexa.files.wordpress.com/2020/06/dosuwugopikibuxegenax.pdf
    • https://bodazilafaje.files.wordpress.com/2020/06/61099761025.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.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_off0000495a.bin
4b1cdeddf177e4e4d942759aba9f92eaa6de24adf38c1f571fff3a28a658a73b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x495A 5116 bytes
font_01_sfnt_off00005a94.bin
33df3dd901d3eff16f54da6ec9a9fc3a2ef996783b9ce8f599e80f553f738c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A94 9404 bytes

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