Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c308d3a958b53a2…

MALICIOUS

PDF

64.9 KB Created: 2020-07-23 14:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d213623cdd185333aeafb9ed637761fa SHA-1: 9ccb909b73f7fc2c2e58c3d00f0c79774abd8e09 SHA-256: 3c308d3a958b53a2181330c9f806446d471a4c177c3073dc80ca126a2e1b69e3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link farm designed to redirect users. One of the primary URLs, 'https://ttraff.cc/wb?keyword=importance%20of%20operational%20research%20pdf', is flagged as malicious. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a malicious redirection scheme.

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/wb?keyword=importance%20of%20operational%20research%20pdf
    • http://files.mayusilkart.org/uploads/1/3/1/3/131383664/2245704.pdf
    • http://files.1percentgallery.com/uploads/1/3/0/7/130774990/kekoruwo_ditafededudeki_pazulurezupesa.pdf
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdf
    • http://files.northarlingtoncert.org/uploads/1/3/1/4/131411197/vomizutojixiwo_dufeweradotebuz_damiduzakuta.pdf
    • http://files.utahsreptilerescueservice.org/uploads/1/3/0/7/130776230/7bae21.pdf
    • http://files.sanctuaries.org/uploads/1/3/
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/18446403813.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/kanozexidewuxewidib.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7255/files/85231108570.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/90639470383.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2031/files/18052502579.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/fenome.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/bexix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/16831079199.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/96227703479.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5911/files/xigamejekubinotuwejufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53940500656.pdf
    • https://cdn.shopify.com/s/files/1/0430/8310/4409/files/gafamotitud.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_off0000c1bc.bin
4b3112b24958902b980636384374e81efec01d973fb009e4f99a995fc4bbdd8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BC 5120 bytes
font_01_sfnt_off0000d2db.bin
2a500500dc8ece7c0212c1da54fce678a7f8899dc2ba69ad6545634c8b3278b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DB 10468 bytes

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