Malicious PDF — malware analysis report

Static analysis result for SHA-256 21211fb94b2ff6d3…

MALICIOUS

PDF

45.5 KB Created: 2020-08-11 00:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1058b062afd69978272f4a716771dde6 SHA-1: b17ea5fb92834b8db5c73c370b161cbcd3105b36 SHA-256: 21211fb94b2ff6d344509233fb83c7f64b1e0cab6f5466644521933274ddaf60
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.ru' is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Case study pdf in english' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=case+study+pdf+in+english
    • http://files.qpsarx.com/uploads/1/3/0/8/130874115/fofawebajuzagutudub.pdf
    • http://tasobi.womeninhistoryohio.com/uploads/1/3/1/4/131453325/8617414.pdf
    • http://files.ftfundraising.com/uploads/1/3/0/9/130969352/zelelabu.pdf
    • http://files.celestialstarsdance.com/uploads/1/3/0/8/130814132/jikulon.pdf
    • http://files.mindfulserenityonline.com/uploads/1/3/0/8/130874629/pezozulaleku.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/bossa_nova_line_dance.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7632/files/gisufenomem.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/44185189472.pdf
    • https://cdn.shopify.com/s/files/1/0432/8590/5576/files/89867970761.pdf
    • https://cdn.shopify.com/s/files/1/0437/3187/8049/files/boston_bruins_schedule_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/wizoxoleruwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/pathophysiology_of_acute_diarrhea.pdf
    • https://cdn.shopify.com/s/files/1/0447/1826/0377/files/hot_body_contest.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/12403999710.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/lettre_de_motivation_en_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/adelaide_s_lament.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/basic_electronics_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/99664200505.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_off0000744a.bin
c66b243dd022929527561f84706432378a8036d6f02091d0c20ee055791a95a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744A 5216 bytes
font_01_sfnt_off0000860d.bin
cd15ead97cda95b190d51ccd2dd26ad5f4dbacda8e7d0adf8866a46a4df5310e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860D 10260 bytes

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