Malicious PDF — malware analysis report

Static analysis result for SHA-256 de25dbef118dcb1e…

MALICIOUS

PDF

42.8 KB Created: 2020-08-18 18:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 179e2fc95f0dca214520c51a816a17d4 SHA-1: b4893753de1d2b42327af41253d1dfd5c8860518 SHA-256: de25dbef118dcb1e88f3b97c208f7371bd481c3e2d4525b01b09e234f7ab80f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=avg+antivirus+for+android'. This URL is likely part of a phishing or scam campaign. The document body also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm designed to obscure the malicious destination. 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.ru/pify?keyword=avg+antivirus+for+android
    • http://files.bundledupjoycreations.com/uploads/1/3/0/8/130874278/884578b7.pdf
    • http://files.texascenterforregionalstudies.net/uploads/1/3/0/7/130739234/7951472.pdf
    • http://voguk.essenceofself.com/uploads/1/3/1/3/131398560/petinuxuxobewogipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/rezepafoteravizab.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5708/files/lekan.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/today_tamil_dinamani_news_paper_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/britney_spears_album.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/glencoe_pre_algebra_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/notugirukomo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/77008287537.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4020/files/xolanukaxepinetabubuxiwos.pdf
    • https://cdn.shopify.com/s/files/1/0435/2085/2122/files/attach_digital_signature_to_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/biodiversity_conservation_seminar.pdf
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/electrical_engineering_technical_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/lista_de_exercicios_analise_sintatica.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5805/files/nixevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9655/5168/files/medical_narrative_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/53943858092.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069fd.bin
15e901bc78c88eab9258760cef70b6586ebb6cff7dd0ec2d236a33d67842ea3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FD 5092 bytes
font_01_sfnt_off00007b64.bin
7fe94bb209d765b7d39509ba8cdd21bdbf05fb1885dd8e9b710ddf19dc7497b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B64 10196 bytes

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