Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6f3cd0ed90eed6…

MALICIOUS

PDF

50.0 KB Created: 2020-08-24 10:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74720d92360608c236420d5963cb1555 SHA-1: 1af5563c4b2a799eafcc91a633083534885b555c SHA-256: 0c6f3cd0ed90eed662d2156d69c1639107041bb32510a10bd2b1ace992e3bd99
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern appears to be link-based redirection.

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=gladius+relics+of+war+space+marines+guide
    • http://files.bo-co-wandering.com/uploads/1/3/1/3/131382078/buvob.pdf
    • http://files.tedxsandhillscc.org/uploads/1/3/1/4/131437106/9353264.pdf
    • http://jiwetepi.skyviewbaseball.org/uploads/1/3/1/8/131856333/3447623.pdf
    • http://radopolud.dispatchesfromindia.com/uploads/1/3/1/3/131379179/9671268.pdf
    • http://files.hairbykida.com/uploads/1/3/0/7/130775223/ef51486.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/91611002442.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/rarewivibigezudovuzaxumoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9904/files/4522007840.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/81989956813.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/test_bocconi_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/9559/5938/files/mogakitamisuzesesugogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wupukibasabozuxijixosi.pdf
    • https://cdn.shopify.com/s/files/1/0449/9347/8814/files/characteristics_of_the_holy_spirit.pdf
    • https://cdn.shopify.com/s/files/1/0438/9247/4011/files/33924621627.pdf
    • https://cdn.shopify.com/s/files/1/0435/2209/7304/files/bejazufuzeki.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/54716851666.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/xeboj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9949/files/legrand_cable_tray_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0437/3089/4999/files/98279376991.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_off000084df.bin
eb087b6a4c0ff84a05c704ec1141a03b0bf4ce5a53cd8bd55dd1267961c7f283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DF 5596 bytes
font_01_sfnt_off000097eb.bin
cf6adeee4d1fa690c9828a2cff5e430f56a7c8e3161eb54010f91d3be6678967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97EB 10192 bytes

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