Malicious PDF — malware analysis report

Static analysis result for SHA-256 043474de20bab2bc…

MALICIOUS

PDF

43.8 KB Created: 2020-11-05 10:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a4db580b2787d9a618d84e6905d233fb SHA-1: 16bd6112761d4a5f378fbbde8d4a9476762755de SHA-256: 043474de20bab2bc8798ce8effaeb73644e72ffb08a310251fe4bae6d5d09d52
182 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. Additionally, it exhibits characteristics of a link farm and includes a visual download button lure, suggesting a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=nisqually+jail+county In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423728/normal_5f993dd68510f.pdfIn PDF document text
    • https://xijuxesipokufi.weebly.com/uploads/1/3/4/0/134042605/rujabibibajokej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f97c20662738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5fa1f20e52ef4.pdfIn PDF document text
    • https://kotugupevexaxis.weebly.com/uploads/1/3/4/4/134493549/58f25300ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5f8dec9395d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5f8decca4d2d8.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/78259c9fc3.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/tejeg.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/e61e1535-fdef-460f-bd43-05d358a47464/lawrence_preston_gise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58bd49b2-0668-4fd6-8797-3d1c89bd73b2/golden_state_warriors_houston_rockets_live_stream_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/4907/1790/files/adobe_zii_2019_4.1.3_tnt_.dmg.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C23 4968 bytes
SHA-256: e073c30383d0904c1198b0c4fc338551bf854b73008ffdd356d7faf64312a0aa
font_01_sfnt_off00007d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D38 11068 bytes
SHA-256: 8df06af9c7aa4c648177ac934d155ab04fadaba11031eeb1d73fcea23fd89a87

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