Malicious PDF — malware analysis report

Static analysis result for SHA-256 d459b9e5b13080d9…

MALICIOUS

PDF

36.1 KB Created: 2020-07-09 05:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d857495edf2b97e1c9b914359b443e15 SHA-1: 9fe053c2130ad39bed07c91f9f68b7c715ed185a SHA-256: d459b9e5b13080d9fc461e7c4caef0d65f033b18bf86fd6cefc325b05656f472
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The presence of a known malicious redirector URL further supports the malicious intent. No scripts were extracted, and the document body primarily consists of obfuscated text and URLs.

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=medical%20microbiology%20review%20pdf
    • http://files.joyfulnoisedoula.com/uploads/1/3/1/4/131406735/51b869.pdf
    • http://files.roejendradesigns.com/uploads/1/3/1/4/131406762/wugagumigejo.pdf
    • http://files.domhawthornmusic.com/uploads/1/3/0/7/130739318/8128496.pdf
    • http://files.elizabethkpetersonlab.com/uploads/1/3/1/3/131384789/sibufajoj-xuvini.pdf
    • http://files.danielleportfolio.com/uploads/1/3/1/4/131407665/8632102.pdf
    • http://files.qcrc.org/uploads/1/3/1/6/131606003/1248500.pdf
    • http://files.standrewcpcodessa.com/uploads/1/3/1/4/131408344/2fa9cf1f1aaf391.pdf
    • http://files.actingcoachlasvegas.com/uploads/1/3/2/6/132681566/lejele.pdf
    • http://files.leahrempelphotography.com/uploads/1/3/0/7/130738507/5997670.pdf
    • http://files.retirementtimeline.com/uploads/1/3/1/4/131483154/gupebagig.pdf
    • http://files.rachelsvineyardtucson.org/uploads/1/3/1/3/131383664/0714680.pdf
    • http://files.orangevalleycreations.com/uploads/1/3/1/3/131383510/bujofaketuwomidabej.pdf
    • https://faxomabulev.files.wordpress.com/2020/06/77053539789.pdf
    • https://tawojubitalu.files.wordpress.com/2020/07/85041375009.pdf
    • https://dafaxekitupu.files.wordpress.com/2020/07/67606192571.pdf
    • https://bakovenorow.files.wordpress.com/2020/06/kuwolazijibizedomijelage.pdf
    • https://gugibuno158581699.files.wordpress.com/2020/06/kifudi.pdf
    • https://texepavogex.files.wordpress.com/2020/06/16722057229.pdf
    • https://zafevilak.files.wordpress.com/2020/07/duvufonabijamixumuliwep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.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_off00005050.bin
66e0771e4e62978a69139f90385e1e95971134e6d5a503ccd4ebcdba12e5da16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5050 5296 bytes
font_01_sfnt_off00006264.bin
c4aa16b1e27be163c2c0e23c3dbcc3c38e676de1abce285f159011ba2345ed4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6264 9648 bytes

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