Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c99417668148a0c…

MALICIOUS

PDF

38.4 KB Created: 2020-08-12 03:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a39c8e1b3cabfddf45f4d01e2e79598 SHA-1: 63f6e51ea65da0a8541ea74b18986e6d85c63b15 SHA-256: 7c99417668148a0c3bff46094dad0084e5f860dc906308fe6e336a164ef274f0
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded URLs, many of which point to external PDF files. One URL, 'https://ttraff.ru/pify?keyword=journal+of+west+african+languages+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. No scripts were extracted from this sample.

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=journal+of+west+african+languages+pdf
    • http://files.thepantry8020.co.uk/uploads/1/3/1/4/131437363/63b8eabfc.pdf
    • http://jetewu.davidcareyimages.com/uploads/1/3/0/7/130738632/gipusimujanosolidora.pdf
    • http://kesiwa.coolharmonies.com/uploads/1/3/1/1/131164250/e7e5d6cfeafb8.pdf
    • http://files.corkscreworders.com/uploads/1/3/1/4/131437157/6916053.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/listening_english_conversation.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/43846105183.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6630/files/74535961377.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0471/files/behaviorist_theory_of_personality.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/11793295259.pdf
    • https://cdn.shopify.com/s/files/1/0437/0359/9272/files/nobivatena.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/6025473771.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/73727203909.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0987/files/copper_ore_stardew.pdf
    • https://cdn.shopify.com/s/files/1/0434/8415/1974/files/how_to_get_photoshop_for_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/55414894591.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/21110503925.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/tiwawomusago.pdf
    • https://cdn.shopify.com/s/files/1/0427/9592/5671/files/fupeziwuxetojibixigagi.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_off0000579b.bin
db4fef822861920b155eeb83393a92fdf7ab932b17886d1e33897ee5bea6dc80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x579B 5404 bytes
font_01_sfnt_off00006a23.bin
af1a9b0f8bbdd632b9c94ea472f9291f724471a946df8c488a64861b0f3f4c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A23 9956 bytes

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