Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8dba14493abf04…

MALICIOUS

PDF

61.7 KB Created: 2020-07-29 08:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba77b69390130355a2374ce1b00408d4 SHA-1: 9b3757eeb2fce1777504bdc926b493e7e0c3d0f3 SHA-256: 6d8dba14493abf0455127cad13cb878e3e4a36a54001442c98c3d64896e02912
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for phishing and malware distribution. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests SEO manipulation for malicious purposes. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bhagavad+gita+chapter+16+sanskrit+pdf
    • http://files.fretnotes.com/uploads/1/3/2/6/132695730/wirub.pdf
    • http://files.kaneswriting.com/uploads/1/3/1/4/131483955/funesuri.pdf
    • http://files.saintpatrickwapella.org/uploads/1/3/0/7/130739949/558173.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/0298/5626/files/37062328475.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/pimujewaxinugusebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8114/6280/files/93149567621.pdf
    • https://cdn.shopify.com/s/files/1/0431/4791/9522/files/27277547142.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/podiwufivagonefu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1855/0430/files/35835111219.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/nedusebosojomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/nuzuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/64805509014.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/wifuveb.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/vuzorukiva.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_off00008795.bin
453b1d8755381eaba03b4a5359c9ab6f722a73d77c7229dc088cce7f330eab3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8795 5444 bytes
font_01_sfnt_off00009a1c.bin
6a7c380dedfb56ec83e2289ef481a6146c417152d792ac9321770df5ed92e95c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1C 15156 bytes
font_02_sfnt_off0000c6b9.bin
a4ca55a1a5186580e4add6d4c4a11fae1f2895837ca7f7c2ad766f509be6f268		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 10900 bytes

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