Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26727545de30098…

MALICIOUS

PDF

51.0 KB Created: 2020-08-06 10:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d485d38433277dc3effa26fb93590459 SHA-1: 39853720d5b21abc5f60d44df86bb656134c0d05 SHA-256: c26727545de300987c74cba97de39378e76d5710f22e6b9a7085aa2e4a0bf7cb
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically ttraff.com. The document body, though heavily obfuscated, contains text related to 'neural networks and deep learning a textbook pdf', suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external PDF links further supports a malicious intent, likely to drive traffic to malicious sites.

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=neural+networks+and+deep+learning+a+textbook+pdf
    • http://files.sarahrosepeterson.net/uploads/1/3/1/4/131438439/tiwoxekofoze.pdf
    • http://files.princealbert.cjsclimbandplay.com/uploads/1/3/2/6/132682171/gometelinagibizo.pdf
    • http://files.helsbellshandmade.com/uploads/1/3/1/3/131384777/4515839.pdf
    • http://files.calebmelchior.com/uploads/1/3/0/8/130874304/3fd43be46.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/3603091925.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/microsoft_office_portable.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/wumanimulumetak.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/7190372043.pdf
    • https://cdn.shopify.com/s/files/1/0447/7750/4925/files/bajrangi_bhaijaan_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/14591890944.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9576/files/agathosma_betulina.pdf
    • https://cdn.shopify.com/s/files/1/0434/8330/0005/files/wemek.pdf
    • https://cdn.shopify.com/s/files/1/0430/5564/4823/files/91806486492.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6161/files/diare_pada_bayi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/67876924518.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/79944416219.pdf
    • https://cdn.shopify.com/s/files/1/0438/7579/5099/files/gozaxotafi.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_off00007a0f.bin
af7915c767c197176b687c8ea5876960b399da1c3262a79c2d83fb079e1b44aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0F 5424 bytes
font_01_sfnt_off00008ca9.bin
6a40a44ddfa7aafd5bbdcff3f69540540bab238e9d9ec914120190db15e12bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA9 10416 bytes
font_02_sfnt_off0000b033.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 4324 bytes

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