Malicious PDF — malware analysis report

Static analysis result for SHA-256 04dabb9795f85fd6…

MALICIOUS

PDF

45.3 KB Created: 2020-08-11 01:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5080dd0852a213c1a23b7307d9c21acc SHA-1: d212e0b4be7ada73f4fc8cc23bde241e5d9fa19b SHA-256: 04dabb9795f85fd6023a9c91b36624215ae2fbc3ca24014b9d4605653af1f8cd
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as a free download for a scientific document. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to redirect the user to malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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.com/pify?keyword=cell+structure+and+function+pdf+free+download
    • http://files.player2reviews.com/uploads/1/3/1/4/131482931/a9bd083c2c75.pdf
    • http://files.austriangallery.com/uploads/1/3/1/0/131070940/pixutujufukid.pdf
    • http://files.dementiatraining4life.com/uploads/1/3/1/3/131398504/jatipoloxu.pdf
    • http://files.rlccoop.com/uploads/1/3/0/9/130969597/fapajix_sexadasinamut.pdf
    • http://files.achievingflight.com/uploads/1/3/2/6/132682802/funubajugimopef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kawovuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/7932/6103/files/logezadiwegaxakif.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/gradient_descent_multiple_variables_python_github.pdf
    • https://cdn.shopify.com/s/files/1/0440/8826/2821/files/58328314802.pdf
    • https://cdn.shopify.com/s/files/1/0438/9493/1624/files/wevotefutigil.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/85077557792.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/2006_suzuki_boulevard_c50_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6022/files/iron_deficiency_anemia_symptoms.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8875/files/carbohydrate_metabolism_biochemistry.pdf
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/84594015558.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1607/files/diablo_3.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007461.bin
ebb515bc03f13b8ce39c3239cfbbfb81758524558a5a6fd65e2a988d8eb5f54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7461 5148 bytes
font_01_sfnt_off000085fc.bin
f4e59f287c0fa9a20a06b0ac676affe20f654046effa6f28ba50f3c2b022fa4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FC 9908 bytes

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