Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9be52ba086f045…

MALICIOUS

PDF

42.6 KB Created: 2020-08-08 06:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c842dd65e8f750f7487607eb93e5a989 SHA-1: d68c6de7e43285810c8b24a4091551e1d2105c71 SHA-256: da9be52ba086f045ce74a47c32ff9544db45786a057b4704c392b67e71a93671
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic firing identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=anabase+saint+john+perse+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the redirector URL is a strong indicator of malicious intent.

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.cc/pify?keyword=anabase+saint+john+perse+pdf
    • http://files.samndoesart.co.uk/uploads/1/3/1/3/131383493/c2dbe6c.pdf
    • http://files.summerlaneborzoi.com/uploads/1/3/0/7/130740256/b7bc014b8fb.pdf
    • http://sonuvo.with-piper.com/uploads/1/3/1/1/131163635/kuwop_muvufanen_pagexizakatof.pdf
    • http://files.zero-waste-warrior.com/uploads/1/3/1/3/131384436/kiligirexamadodi.pdf
    • http://rurof.radiusannex.com/uploads/1/3/1/6/131637814/4236899.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5815/files/98602798099.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6348/files/electrical_wire_color_code_chart.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/53480045467.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/tormented_soul_divinity.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/82033255759.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/agresti_introduction_to_categorical_data_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8759/files/toyota_7fgcu25_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/chauffeur_license_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/wimetamu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/xetipoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevaziretojigadogikoranab.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/71099968129.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_off00006754.bin
a1f739451a786e1f329edade9b16e9e77f1a89949c4eac2de8f35474913d7a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6754 5300 bytes
font_01_sfnt_off00007952.bin
be2185bb69f1fc43a1012c1e6ce27fc68c6fab802c599e3f2d318693ece43fac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7952 10564 bytes

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