Malicious PDF — malware analysis report

Static analysis result for SHA-256 34065ee54da9d64d…

MALICIOUS

PDF

44.9 KB Created: 2020-08-12 04:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6efd52169b0eaddc5fce7b532300b36b SHA-1: 9018aedcc2b00446dff7a6a6b950cd2bbd2f53e0 SHA-256: 34065ee54da9d64dafdff5a73242c17392d52b41c26b659901733bdf809047d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a specific malicious redirector URL, suggesting an attempt to drive traffic to potentially harmful content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and a plausible lure related to "geological engineering pdf".

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=geological+engineering+pdf
    • http://files.reading2reading.com/uploads/1/3/0/9/130969555/49253ecafb.pdf
    • http://files.cheshirecareerhub.net/uploads/1/3/0/7/130738903/171002.pdf
    • http://parop.ucfifc.com/uploads/1/3/0/9/130969352/4986591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1103/0690/files/nibomo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3698/files/dazekajolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/53255870431.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/89206763129.pdf
    • https://cdn.shopify.com/s/files/1/0437/4046/3255/files/mafuturidovujipubezus.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/ripexika.pdf
    • https://cdn.shopify.com/s/files/1/0435/5463/5937/files/hematology_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/air_pollution_control_a_design_approach.pdf
    • https://cdn.shopify.com/s/files/1/0431/0401/0389/files/career_paths_medical_teacher_s_book.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_off00007269.bin
30d58d9e4e13299228fcf91807144b778713287e288f3d07b2260ac62dfea73f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7269 5176 bytes
font_01_sfnt_off00008417.bin
a50c13c1bc6bf9a992fd908fd19df21a731bedb4b6f5844356263dfbc5e3b5bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8417 10304 bytes