Malicious PDF — malware analysis report

Static analysis result for SHA-256 766b26df685ca7d1…

MALICIOUS

PDF

44.5 KB Created: 2020-08-10 01:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f152535b1a893e9d6369ab3a75af35d SHA-1: adb59af9beb20ac87bae7dcfcc935fa9a55e30bc SHA-256: 766b26df685ca7d1b37540773cb5321bc80a3c001392072eec1a060ecccc868d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The document body, though heavily corrupted, contains a URL that matches the primary malicious redirector. This suggests the document's primary purpose is to direct users to malicious sites.

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=alto+sax+songs+pdf
    • http://files.hostmaster.abodeinteriordesigns.co.uk/uploads/1/3/0/7/130740138/2716145.pdf
    • http://files.fishmougey.com/uploads/1/3/2/7/132741348/7028152.pdf
    • http://files.extensionslashnbrow.com/uploads/1/3/1/4/131407112/tafidovo_sukugisudubupip_miponazujubig_femoropewiwilu.pdf
    • http://files.malopesportfolio.com/uploads/1/3/1/4/131454012/9528d08d.pdf
    • https://musescore.co
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7835/2034/files/apollonia_saintclair.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/texas_county_fips_codes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/fopigufuvamazoligu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7676/files/91505836653.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/xamesefetikefidif.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/77832693424.pdf
    • https://cdn.shopify.com/s/files/1/0431/2530/9604/files/recovery_server_could_not_be_contacted_mojave.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/82065046291.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/59557648211.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/ata_chapter_5.pdf
    • https://cdn.shopify.com/s/files/1/0437/7634/4225/files/73183219259.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/60952241196.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ef6.bin
770b7655a016a2718b54aa1280f49f16949ab9ed7eb81d5ad055b99708868aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EF6 5172 bytes
font_01_sfnt_off000060af.bin
a9ba8bf2e6a04950f1b47eaada0a0bca0a0e0fd561ade8f4f6f88cb4c343bd37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AF 14208 bytes
font_02_sfnt_off00008e3f.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3F 16204 bytes

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