Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a98fd69c3808fd0…

MALICIOUS

PDF

40.6 KB Created: 2020-08-22 08:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ca4e4140e81ed826e56499bb0cd3db6 SHA-1: 88f12a02323b5929b26c820db654400fc83dbb1c SHA-256: 6a98fd69c3808fd08c12f0a5844b905742aaeaec056ebfa2949e1eeaf1984bf0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though partially corrupted, includes the same malicious URL and references to educational worksheets, suggesting a lure to phishing or malware distribution sites. The ML classifier strongly indicates 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.ru/pify?keyword=dictionary+definition+worksheet+ks2
    • http://ruropugib.eliadeleon.com/uploads/1/3/1/0/131070827/9688140.pdf
    • http://files.mail.byboukje.nl/uploads/1/3/0/7/130775677/f2e343fd04b4.pdf
    • http://mobokipi.samanthadelgarno.com/uploads/1/3/2/8/132814930/xadilefovixonodeba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3041/2454/files/voxubapuxizinarixigexap.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4797/files/cyrillic_on_android_tablet.pdf
    • https://cdn.shopify.com/s/files/1/0435/6780/8667/files/58603195479.pdf
    • https://cdn.shopify.com/s/files/1/0438/8962/3208/files/99642111045.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7331/files/sexomagupatadeba.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9733/files/tn_bill_of_sale_for_car.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/tivipidakurilezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94192334972.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/cenas_saludables_para_bajar_de_peso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/sexafi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2775/files/dasetemobolazos.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/79201336563.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/fudafemuzumafivulemunafok.pdf
    • https://cdn.shopify.com/s/files/1/0440/4461/5830/files/32751481967.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_off00006046.bin
9db5c10161cea1715f0e0f2bd1904ef4507f3ba7d4a7d6e50387715dbdbf381e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6046 5464 bytes
font_01_sfnt_off000072f5.bin
533a33c260746db457696c0dba96e2b09a698711eb9183012ea74e864b7f6e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F5 10208 bytes

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