Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10475764a3242a9…

MALICIOUS

PDF

40.7 KB Created: 2020-07-10 07:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: a40f491c8a786a8c93460b0526a7c444 SHA-1: 4bda5446360484e3d5fcfc72da36c241cabb6326 SHA-256: b10475764a3242a9de4fe5ab78056f65417f2ba3d76908955e32a8e7b2403565
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document contains numerous embedded links, including one pointing to a known malicious redirector. The document body text, though obfuscated, contains keywords related to educational material and includes the malicious URL. The presence of a 'download button' heuristic further supports the lure. The primary intent appears to be redirecting the user to malicious infrastructure via a deceptive link.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.cc/wb?keyword=11th%20class%20science%20book%202019%20pdf In PDF document text
    • http://files.niagaralearningacademy.com/uploads/1/3/1/4/131408528/lojavawajesun-wuzibulelanot.pdfIn PDF document text
    • http://files.yogaunme.com/uploads/1/3/0/7/130738830/mezunezotikomipefa.pdfIn PDF document text
    • http://files.thinkingcapsza.com/uploads/1/3/0/7/130776272/7589564.pdfIn PDF document text
    • http://files.alrajabahrain.org/uploads/1/3/1/3/131381722/f167759cfe5c276.pdfIn PDF document text
    • http://files.codyshauling.com/uploads/1/3/0/7/130740127/ce3ae0e4c5d82.pdfIn PDF document text
    • http://files.gelaboutique.com/uploads/1/3/1/6/131636972/19e76cef0848f.pdfIn PDF document text
    • http://files.cfdebate.com/uploads/1/3/2/7/132741764/miwumigugiramimoxod.pdfIn PDF document text
    • http://files.rockthecatspa.us/uploads/1/3/1/3/131379940/a7ffe8bbfcbb5c4.pdfIn PDF document text
    • http://files.sweetbabiesdayhome.com/uploads/1/3/2/7/132740320/zipud_wenuv_soraminudej.pdfIn PDF document text
    • http://files.nehb.net/uploads/1/3/0/7/130739557/ac2cb225b6807e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jezafuxowufi.files.wordpress.com/2020/07/ninese.pdfIn PDF document text
    • https://zimixukegor.files.wordpress.com/2020/07/43836005630.pdfIn PDF document text
    • https://sixuxonudibi.files.wordpress.com/2020/06/wuvuwasamawanef.pdfIn PDF document text
    • https://nebeseti.files.wordpress.com/2020/07/jafaduzak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64830269039.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rixaraxamixenapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53940500656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6255 5524 bytes
SHA-256: 46c5e250fee011d04033bdca39f293a7b00776c99b05d1c875f14a44e0d84af2
font_01_sfnt_off000074ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74FF 9688 bytes
SHA-256: 690246ef6968a5cb6cd100ec13e8588a954783b9b0bd6b0141903486e6aee351

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