Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69787addc798728…

MALICIOUS

PDF

69.3 KB Created: 2020-11-14 05:28:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 468bf3b1e514ee7e19a5760d0fdb0b96 SHA-1: 250292fa1c274242e2105fffed0ca7784b52b141 SHA-256: f69787addc798728e369ee36ab71c5e2b564678e69f9aca15ee2ef93f7c58843
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, with heuristics indicating a link farm designed to redirect users to malicious infrastructure. Specifically, it links to 'traffmen.ru', a known malicious redirector, and a large number of other PDFs hosted on weebly.com. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=asu+prep+academy+casa+grande In PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/kejedobelezon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_5f9636fb4a319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5fae80a3225e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f883e046e943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c310ec-9412-40e0-9b47-65b8887be0cc/97254187491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa29677a-a973-466e-b692-1e4a4448b37a/hotmail_sign_inhotmail.com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c675f90e-6a04-4fb4-882d-808f56c75d85/76085241762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6efad9-537a-423d-a083-75df93fb34ef/88495641111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb38277e-c404-429f-bef1-cf71e56da2d2/8942406590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c45efd-6bed-4219-8e69-2f787292a6a6/mivuvarejama.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/kenop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1837686-b0b1-47e6-9218-c36f60adfa73/mukojamevedugufowiwowesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34ba2cd-a7ea-4c75-b0a4-ba2889751a95/hawaiian_flower_tattoos_meaning.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BB 5452 bytes
SHA-256: b2e119097b6549f36168c2a76c5a9672cf6bbc1cbacf706a45158d47985ed385
font_01_sfnt_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 11436 bytes
SHA-256: 555177182cf861e8b880e8b3aacc7088b06c7b5e830bfe9688589bfe57a4da1f
font_02_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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