Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a2d87576840a60…

MALICIOUS

PDF

104.5 KB Created: 2020-07-19 21:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da5bb7073f9b31204da796994cbe78fa SHA-1: 7433b0c66e629be676ceeb5175bc65ea21779766 SHA-256: 95a2d87576840a600283b1d36c9a32c83bf8fd59f7b0b82bb089722319c930ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, identified as a link farm, designed to redirect users to external websites. One critical heuristic specifically flagged a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the mass distribution of links to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wb?keyword=hyperglycemic%20crises%20pdf%202018
    • http://files.somersscienceresearch.com/uploads/1/3/1/4/131438419/1859434.pdf
    • http://files.4livesports.com/uploads/1/3/0/7/130739142/7c7ccbeda.pdf
    • http://files.amomentfrozen.co.uk/uploads/1/3/1/3/131378779/meruk.pdf
    • http://files.diannebersea.com/uploads/1/3/1/8/131856277/geduditenabav_duvovawopage_digenamexex.pdf
    • http://files.heartpieces.net/uploads/1/3/1/3/131379749/3776242.pdf
    • http://files.presscoffee2go.com/uploads/1/3/1/4/131408970/1917072.pdf
    • http://files.jfcountypets.com/uploads/1/3/2/3/132302764/5787978.pdf
    • http://files.859sqn.org/uploads/1/3/0/7/130775668/039a5c9fe2f.pdf
    • http://files.gowoonlee.com/uploads/1/3/1/0/131069819/doguluwedi.pdf
    • http://files.tiogapawprints.com/uploads/1/3/1/4/131452997/4786731.pdf
    • https://wuxewaxijij.files.wordpress.com/2020/07/45888153263.pdf
    • https://xawuwerix.files.wordpress.com/2020/07/xogibemanepenawekotavixo.pdf
    • https://gepuwovu.files.wordpress.com/2020/06/zirefafesi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/wezoveriti.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/patarakewijuxasokug.pdf
    • https://cdn.shopify.com/s/files/1/0430/5960/9753/files/tezofakesavevuriguse.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/15400194271.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/13566479896.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4080/files/99990687695.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/44004704146.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/fapojafotopumanokufa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/62169291980.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sebifoxof.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001548b.bin
e76c1217583ee7fb638fe8a875916fded1f141ab8a3a89e2c008c0dfe80ff191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1548B 5340 bytes
font_01_sfnt_off000166c7.bin
1262109d88035aeb063b465ea49900a54b98b774add18e65e1296e6e4bc33491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166C7 14100 bytes

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