Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb25f7806dbafe1…

MALICIOUS

PDF

42.9 KB Created: 2020-08-17 01:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf79d7cceb9db4237694370cf7880752 SHA-1: 3195c8e15f9966da1265d26edd07bfffec8b7102 SHA-256: 0cb25f7806dbafe189e85340a5e9b4f0b4a39ff3bfa109c5bc6041a183abcfea
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though obfuscated, contains text suggesting it is a worksheet, likely a lure to encourage clicks on the malicious URL. The presence of many external PDF links suggests a link farm or SEO poisoning attempt to distribute 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.com/pify?keyword=geography+of+europe+worksheet+pdf
    • http://files.elliotgardner.com/uploads/1/3/1/4/131406893/a1454a639.pdf
    • http://files.co-oplink.net/uploads/1/3/0/7/130776022/6f55d1c6437babc.pdf
    • http://lusikaka.star-keys.co.uk/uploads/1/3/2/6/132680903/9479691.pdf
    • http://jesedij.vikrantmuthusamy.com/uploads/1/3/2/6/132696483/3858256.pdf
    • http://javujira.windsweptwillow.com/uploads/1/3/2/3/132303382/zuvowupaxazi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2068/1377/files/nigokibare.pdf
    • https://cdn.shopify.com/s/files/1/0430/8585/6919/files/41486931538.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/28621849338.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/kiwiritupusakawugelerogob.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/how_many_seasons_of_adventure_time.pdf
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/11029756775.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/authentication_vs_authorization.pdf
    • https://cdn.shopify.com/s/files/1/0439/1141/3915/files/diwub.pdf
    • https://cdn.shopify.com/s/files/1/0437/4721/3464/files/93391933079.pdf
    • https://cdn.shopify.com/s/files/1/0430/3604/9571/files/the_inbetweeners_movie_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/3160/0031/files/pay_shell_credit_card.pdf
    • https://cdn.shopify.com/s/files/1/0429/3967/8886/files/famab.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_off0000600f.bin
219a90706af154f60e7dd901ff358be33391de82f890bfb7f9f3fa6137a36e62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600F 5560 bytes
font_01_sfnt_off00007315.bin
e09b62c021696b5986f56790159deff65d1ce61d8f5b178e28efc83e251cdd93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7315 14132 bytes

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