Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb555aa1dc707fa1…

MALICIOUS

PDF

46.9 KB Created: 2020-07-21 06:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3231b3a9c229d27de23b1c72e19b6169 SHA-1: 522dba2a9f397959a8c8a13858be75bd628ef596 SHA-256: bb555aa1dc707fa10032327dab54d3f33e4ef07077e3e090d6f1f045d93e6549
152 Risk Score

Malware Insights

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

This PDF file contains embedded links that point to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, appears to be a lure related to 'histology test questions pdf'. The primary malicious activity observed is the redirection to a malicious URL, likely to deliver a secondary payload or phish for credentials.

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/wb?keyword=histology%20test%20questions%20pdf
    • http://files.demonjardin.com/uploads/1/3/1/1/131163620/4065556.pdf
    • http://files.luzmirandaspanish.com/uploads/1/3/0/9/130969603/830194.pdf
    • http://files.scoreortho.com/uploads/1/3/0/7/130775071/siwavowifa.pdf
    • http://files.prowashmyrtlebeach.com/uploads/1/3/0/8/130874526/c7a22.pdf
    • http://files.prowashmyrtlebeac
    • https://cdn.shopify.com/s/files/1/0432/8977/2190/files/23664845517.pdf
    • https://cdn.shopify.com/s/files/1/0436/0939/1261/files/76660694931.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/35593430291.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/zebubedur.pdf
    • https://cdn.shopify.com/s/files/1/0433/2165/5464/files/37103199054.pdf
    • https://rubewutuneme.files.wordpress.com/2020/07/69737555010.pdf
    • https://vuvogol.files.wordpress.com/2020/07/sawaluvob.pdf
    • https://rixidoxamuge.files.wordpress.com/2020/07/fegapizimi.pdf
    • https://bezizafutef.files.wordpress.com/2020/07/41867817974.pdf
    • https://vugekizebiw.files.wordpress.com/2020/07/genumejidejapevotupun.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/sijuloxoxibageloxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/15457592451.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/jovipusobivapabedisaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/35463139881.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/86921720264.pdf
    • https://cdn.shopify.com/s/files/1/0435/5542/2369/files/livijogexug.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_off000077ae.bin
86359e552463f879cddae2b739f11bee58b825db4e499799e8dccfdb74d62d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AE 4972 bytes
font_01_sfnt_off000088a9.bin
96dc20de9f50aed958070e55fa23215bbe559a3ac8053d05c664f76c10340e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A9 11164 bytes

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