Malicious PDF — malware analysis report

Static analysis result for SHA-256 f291b60efea64a30…

MALICIOUS

PDF

74.9 KB Created: 2020-08-10 04:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eefc178cc3de8cdc299eb0a286f2edba SHA-1: fc893e94e7f8486bbd84cde99e71b21ee34d294d SHA-256: f291b60efea64a3003a28a4fcceb8665387221fdd3026493c0f72c904f349043
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One prominent URL, 'https://ttraff.ru/pify?keyword=biography+bob+marley+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'biography bob marley pdf' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent of redirecting users to harmful infrastructure.

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=biography+bob+marley+pdf
    • http://files.rydesouthflorida.com/uploads/1/3/1/4/131407625/4530179.pdf
    • http://files.riskohseq.com/uploads/1/3/2/8/132815298/ximolegefukej.pdf
    • http://files.lifelonglearning-charlotte.org/uploads/1/3/1/3/131398424/wigaxulifederox.pdf
    • http://files.larchiduc.com/uploads/1/3/0/8/130814855/kamedawivuzemek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0556/6366/files/nizarufuzugapisepozozubek.pdf
    • https://cdn.shopify.com/s/files/1/0432/7922/0891/files/63099427888.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7094/files/kasigufez.pdf
    • https://cdn.shopify.com/s/files/1/0431/7829/5450/files/86012914964.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2161/files/towevitidabizum.pdf
    • https://cdn.shopify.com/s/files/1/0431/4782/1212/files/64841452652.pdf
    • https://cdn.shopify.com/s/files/1/0429/7008/7587/files/suziludufolinebaponor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/19963737127.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/new_af_form_910.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/fisumadunoj.pdf
    • https://cdn.shopify.com/s/files/1/0451/0570/9219/files/anabolismo_proteico.pdf
    • https://cdn.shopify.com/s/files/1/0432/1578/2048/files/swing_trading_with_options.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/sandcastles_beyonce_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/ielts_reading_passage_with_answers.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_off0000e826.bin
08a96b3c803598190aa347ab9b14c1e51e77ad06dbe557212958470299a8204e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 5568 bytes
font_01_sfnt_off0000faf6.bin
6f4b48e283dc27bca9ffb93966d48beb647ca5f30912efe684c9dac85f296a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 10380 bytes

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