Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9c05b9e8a02c46…

MALICIOUS

PDF

46.0 KB Created: 2020-08-13 08:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 007cac45975102350754936f0b72fb47 SHA-1: 64b8700f9832f67bb110b2a2b7d3a75991a0ec04 SHA-256: 5f9c05b9e8a02c46b9b5d8dbf63f8043bef257cfddbfa3fe47c2f189c8368f04
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wb?keyword=ssc%20geography%20syllabus%202019%20pdf%20download
    • http://wabegeg.jacobsones.com/uploads/1/3/2/7/132740214/mafox.pdf
    • http://files.dceoralhistoryproject.org/uploads/1/3/1/3/131383318/170aad3.pdf
    • http://files.ajmsphotography.com/uploads/1/3/0/8/130815228/2bb7ee9.pdf
    • http://timifisov.sbtravelbureau.com/uploads/1/3/2/6/132681737/2202750.pdf
    • http://files.monroecountykychamber.com/uploads/1/3/0/8/130814124/pegumeviko_lovijovotugus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/fazabibovamakiful.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1274/files/gojowupopozotikuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/56443496609.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/62238520376.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/sizifagolibur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0437/7827/7527/files/stages_of_academic_writing_process.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/mepafevunomarinalaxupuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bamizubonofosexewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31240515614.pdf
    • https://cdn.shopify.com/s/files/1/0438/0780/1504/files/78512529215.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_off00006c50.bin
16debea5c2f45eed4a40450af7d852420d0d23832dd4a0bc61fbb8026fa74160
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C50 6336 bytes
font_01_sfnt_off000081d8.bin
fb69aee2224beb11ebff3fea86ec95324499f166a7ef0e968ceb448d912fbe58
pdf-font-stream PDF embedded font (sfnt) at offset 0x81D8 12924 bytes