Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57abd27797e670c…

MALICIOUS

PDF

30.7 KB Created: 2020-10-01 00:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 32341d9be47eae79022a9cc8fd54c4f2 SHA-1: e373316f763e8dcafd3e2467301d12eb05137486 SHA-256: a57abd27797e670c04a51081d73220666c72a3fba35a92de34877f8a1e9bec7b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to SEO link farms and redirector infrastructure. The document body text, though partially corrupted, contains a URL that is also present in the heuristics as a known malicious redirector. This suggests the primary purpose is to drive traffic to malicious sites, likely for further exploitation or phishing.

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://gettraff.ru/strik?keyword=principles+of+blast+furnace+ironmaking+biswas+pdf+free+download In PDF document text
    • http://mexuta.ebbtidewellness.com/uploads/1/3/0/7/130775830/8206164.pdfIn PDF document text
    • http://gazitoxek.richfeenstra.com/uploads/1/3/1/4/131454215/soxewedulu_xunoromurato.pdfIn PDF document text
    • http://files.maurajlecturer.com/uploads/1/3/2/6/132695513/3436118.pdfIn PDF document text
    • http://vegeviw.thekindamom.com/uploads/1/3/0/7/130775350/tilewinimuz.pdfIn PDF document text
    • https://site-1037222.mozfiles.com/files/1037222/piletenitaxaxowulane.pdfIn PDF document text
    • https://site-1036955.mozfiles.com/files/1036955/73551856776.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/54dc1703-6672-4a3b-b8de-df2d3bec79b8/nurewazugefimebut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/63752891812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/3482/1032/files/donabefiraxebusoni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1764/9821/files/zivapezuvor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/acclaris_sign_in.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_off00003e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E11 5772 bytes
SHA-256: 64d697181bd696933ca29500ac3d4f02fb0f7d6e35691df75217fabd4d30a1db
font_01_sfnt_off000051b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51B1 8184 bytes
SHA-256: a20988db33331e6e13a06a22739c8b6a34e400cac7ddfbc36e3dcf2d3f7041e1

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