Malicious PDF — malware analysis report

Static analysis result for SHA-256 097abd708bf1c55f…

MALICIOUS

PDF

51.0 KB Created: 2020-08-10 03:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cdbbc89bcfb76bdc8d02fe5e47cfd78 SHA-1: 39babb9299fb51cbff7515a3882ee09e7db192db SHA-256: 097abd708bf1c55f0506aec79db3b021fa72a974c8ef74f0972614324a9cb647
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or phishing pages. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that likely serves as the initial lure.

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=ipa+sounds+of+english+pdf
    • http://dekapov.lolaandco.com.au/uploads/1/3/1/4/131454024/6970b19db892.pdf
    • http://files.br3h.com/uploads/1/3/1/3/131398097/rizudigug.pdf
    • http://files.ctabrelief.org/uploads/1/3/1/4/131483719/kozanato.pdf
    • http://files.veronicaperytphotography.com/uploads/1/3/2/7/132712615/sezipaxet_ladosobopoluka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/wevuxudu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0486/files/benim_hocam_matematik_zml_soru_bankas.pdf
    • https://cdn.shopify.com/s/files/1/0434/7625/4873/files/dokufo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7235/5478/files/86774772662.pdf
    • https://cdn.shopify.com/s/files/1/0432/0916/2907/files/lalovuvaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/princeton_review_1007_gre_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5249/9095/files/68006469094.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/22185319822.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/sudatuxunokezoraku.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/basel_iii_regulations_summary_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/19244002802.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/rajuwor.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/keroraburegamovum.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/29247708940.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_off00007623.bin
6a7fd581d685138f8c45101474b90cc585f6397539cff314903f0e4ca1260442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7623 5144 bytes
font_01_sfnt_off000087a5.bin
0d97e9c061dec8a4d3368615ee8edf8cd7ebd910bedcebdbe623b8610b66df76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A5 17388 bytes

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