Malicious PDF — malware analysis report

Static analysis result for SHA-256 1131ef120737d256…

MALICIOUS

PDF

46.4 KB Created: 2020-08-05 04:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a47c57ca8053dc49d817eea7895a904 SHA-1: 7f1595f38a07bdd3a1fd4729007f70c9e7c05a12 SHA-256: 1131ef120737d256893623cf4e0e0999c6ee407e0fd36edf18f593499cbe4ef7
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to 'mcdonalds employment application pdf'. This suggests a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a social engineering attack.

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/pify?keyword=mcdonalds+employment+application+pdf
    • http://files.mssimonsays.org/uploads/1/3/2/6/132681698/65fb64214e84.pdf
    • http://files.burnsidecentre.org.uk/uploads/1/3/1/6/131636834/4466461.pdf
    • http://files.electricslidinggates.co.uk/uploads/1/3/2/6/132682282/2558304.pdf
    • http://files.additadvertisingsa.com/uploads/1/3/1/4/131410158/gafesabazalikatisene.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/3774/4552/files/sixewilifasusawo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/7865781664.pdf
    • https://cdn.shopify.com/s/files/1/0431/8334/1728/files/vaxafuvofogirabik.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/abdomen_agudo_inflamatorio_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0431/5620/9819/files/60248907054.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/27014073346.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8717/files/kulerobosapo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0152/files/fajenawisejumaxiginetig.pdf
    • https://cdn.shopify.com/s/files/1/0429/5150/8131/files/46813051303.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_off00006881.bin
f516cf822a3f857c4cc2204f58982855ea0b03536f5721708b1f00e58a5da1e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6881 5100 bytes
font_01_sfnt_off000079ca.bin
1ef352b06487a1cff8d751b8a6c7432d612dd5c7fc04619307b95faf3b2ba99c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CA 10824 bytes
font_02_sfnt_off00009e79.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E79 4324 bytes

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