Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2b7807059f6e32…

MALICIOUS

PDF

45.7 KB Created: 2020-08-13 23:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc4deca08209121e14d4a0adec1a1c27 SHA-1: 6cdd1cf6961074acb2d164bac2fe7f391ffa7e5f SHA-256: 6c2b7807059f6e32a28897b6086765f3154b64bf2247fac444915398637e33ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains text related to a school report and a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of numerous links, including one to a known malicious redirector, strongly suggests an attempt to direct users to malicious content.

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=langford+primary+school+fulham+ofsted+report
    • http://files.leapinlizardsdaycares.com/uploads/1/3/1/3/131383791/4b552d70.pdf
    • http://lujiru.emmausbaseball.com/uploads/1/3/1/3/131383314/demibilu-lodenevu-vogixugusunafag.pdf
    • http://files.marilynmanfrom.com/uploads/1/3/1/0/131071298/8753242.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/aisan_carburetor_tuning.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8102/files/vomefusepo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/xikeruduli.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/71249804324.pdf
    • https://cdn.shopify.com/s/files/1/0434/8752/7078/files/dapezirojusotul.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/15409981048.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9759/files/learn_autocad_basics_in_21_days_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/12138504859.pdf
    • https://cdn.shopify.com/s/files/1/0438/3647/3501/files/97969133911.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/banubozimipazevivogatig.pdf
    • https://cdn.shopify.com/s/files/1/0447/5600/9111/files/30517335086.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/19250923015.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/65840052191.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_off00006803.bin
27007de860982d1515ede5666b58f13176779e003a381d60331ca06152c73678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6803 5612 bytes
font_01_sfnt_off00007af5.bin
c8d7b10aaf5485e0604c4d366663d0163a624019710bfa996960411a355a2960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF5 14988 bytes

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