Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdc1845d4ad4df5…

MALICIOUS

PDF

45.1 KB Created: 2020-08-09 12:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5ee967f60e800f15f9631e67885a5b4 SHA-1: 23207a6b3a443bc4d0e36af8d736b6cb41ee5778 SHA-256: ebdc1845d4ad4df5bc013fd315bc6dab7349975cf23a966cab03589b54624b91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=btc+first+semester+paper+2020+pdf'. The document body, though heavily obfuscated, contains references to academic papers and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious infrastructure.

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=btc+first+semester+paper+2020+pdf
    • http://files.anveshaworkshops.com/uploads/1/3/1/0/131070362/tifijan.pdf
    • http://files.regencyparkcary.com/uploads/1/3/0/7/130775205/718f1ef15ed4.pdf
    • http://duruli.alchemistmovement.org/uploads/1/3/0/7/130775840/somafosev_didaja_babukuvuki_gonopoju.pdf
    • http://files.frontierresort.net/uploads/1/3/0/8/130815381/0c97178.pdf
    • http://files.horvathspecialtyauto.com/uploads/1/3/1/4/131437683/6562346.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1510/files/tizowinubipitedorig.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0293/files/96620138367.pdf
    • https://cdn.shopify.com/s/files/1/0438/1310/9917/files/2988557234.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/bazoworujemexufenibitaxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6843/files/39050080032.pdf
    • https://cdn.shopify.com/s/files/1/0433/2158/9913/files/93819533980.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/buck_converter_working.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/20947738305.pdf
    • https://cdn.shopify.com/s/files/1/0435/0679/4651/files/case_study_qualitative_research_examples.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/70193328966.pdf
    • https://cdn.shopify.com/s/files/1/0433/6120/6422/files/puxatak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57896919986.pdf
    • https://cdn.shopify.com/s/files/1/0433/9705/4631/files/best_boss_gt_8_software_editor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006478.bin
a86880b35c4ca0e4e7ddb63290395d0f90e74677e6232a7a13a1e1fc84574234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6478 5592 bytes
font_01_sfnt_off00007765.bin
1125d73487f8882a938748d47223e12f5437a22f2a608c9d90c00d7750000cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 10180 bytes
font_02_sfnt_off00009a33.bin
fc87a586f3c5e4631c06566de169d90ae6a3d05e7076b5e9f470d017a7779203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A33 3192 bytes

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