Malicious PDF — malware analysis report

Static analysis result for SHA-256 c397a3ba6d0a3d57…

MALICIOUS

PDF

37.0 KB Created: 2020-11-02 06:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 92d71ef5e01c8d501bd6c5da4823fd3e SHA-1: 7d59c72e9e3a567e3f01d6b41b2f0c7c6b328cd7 SHA-256: c397a3ba6d0a3d573adae5e386c6aa9c4b4d495cb4b29169bf325feb8992a291
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting an attempt at SEO poisoning to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The document body contains text that appears to be a lure, referencing a 'physical science newton s laws worksheet key'.

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.link/123?keyword=physical+science+newton+s+laws+worksheet+key In PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/bapujim.pdfIn PDF document text
    • https://xijanejomasug.weebly.com/uploads/1/3/4/5/134506458/1ba8e9201592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1b3a7a44-e046-447f-85a2-c5c98e67a09a/48665280798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a28768-178f-4b4a-8c05-5513d1af7e81/jacob_boehme.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/44631081332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14f5108-5035-4325-9c48-e6e614cbe6bc/ff14_tam_tara_hard_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/9181/8154/files/codec_bsplayer_para_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2625046c-3fd7-4851-8a1b-602c1f6acee2/2011_ford_f150_xl_cabin_air_filter_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34aade8-85fa-4a88-aa68-f92a8effef50/python_for_everyone_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4cb612-c640-47f1-ad8b-0da4ed365e4c/dizoketakaduvivalaxas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7686/8514/files/join_2_pages_into_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ee5a76-a05f-4c83-ace1-4856f695290b/xotobifamojukozesumi.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/4199009851.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/guxukevewet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4727 4932 bytes
SHA-256: 555b6f0133e6262b4c37b69822a19a2f669bb85b42b3e645bff88e476b347b89
font_01_sfnt_off000057e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57E3 9480 bytes
SHA-256: 56533767e84260826230cd225f053c4269b9e94c97fccf1607e89bc66c8453d2
font_02_sfnt_off00007840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7840 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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