Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8b4dbb2013c4fc…

MALICIOUS

PDF

35.7 KB Created: 2020-10-09 13:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 64e67d3eaaa4272535a309c5cabb6f7c SHA-1: e428e4def87219a2937e9510876ef22e2a85f2ab SHA-256: da8b4dbb2013c4fc2bf99bb682cb3de5baa0f9cc42bc6dba3f501e7123deba7e
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users into clicking these links, which likely leads to further malicious activity such as phishing or malware downloads.

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/pify?keyword=verbo+ir+no+present+perfect In PDF document text
    • http://files.superthinkmedia.com/uploads/1/3/0/9/130968996/8536411.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/48d367a4-33ae-4e3a-9a77-1c9cc7a21767/zojolafowowiroromo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58d8e84-affc-4d41-ae17-87ebb87d5ee7/vixaxibukot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741abcb7-6ef1-4967-98ac-893e29d34ac6/57267932187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/568103fe-573c-422e-83eb-79448f7d3c97/xaduzepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d7c686-e444-418f-bc10-c08acb706921/rifef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4432/1945/files/hp_laserjet_pro_mfp_m521_pcl_6_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1723/8688/files/blue_book_of_grammar_subject_verb_agreement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/9434/4348/files/10_hour_timer_count_up.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_off000043cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43CF 4660 bytes
SHA-256: f234b61422a7b12ccaedcec2fe418b9a1998d607afcd1dac91726ce2267e109b
font_01_sfnt_off000053a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53A7 9644 bytes
SHA-256: 921557be874cac7f50e1d594da9e33732be9c3415a83f7a4707e1fb8858ef525
font_02_sfnt_off000074a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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