Malicious PDF — malware analysis report

Static analysis result for SHA-256 6233547cbe37d533…

MALICIOUS

PDF

50.4 KB Created: 2020-07-14 04:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66d11065f1da3c00f5e5a630249c1b51 SHA-1: 083c2edbd2ad3377a667dbf446035a2f03ef0e97 SHA-256: 6233547cbe37d533729ded1d047185fe05f9cde974c53cdcc4f268a04c7dba90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on WordPress and appear to be part of an SEO link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains keywords related to technical interviews, likely serving as a lure.

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/wb?keyword=chemical%20engineering%20technical%20interview%20questions%20and%20answers%20pdf
    • http://files.martimmo.com/uploads/1/3/1/4/131408465/b0125c.pdf
    • http://files.sharethemusicvt.org/uploads/1/3/1/3/131398589/40f3f7bc7ef71f.pdf
    • http://files.gaindetalks.com/uploads/1/3/0/8/130874629/dojoja-kefuzegomoli-wadab.pdf
    • http://files.yassvalleyk9.com/uploads/1/3/1/4/131455328/a87d5002584.pdf
    • http://files.stemonline.org/uploads/1/3/1/0/131070938/potaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://taxowedolez.files.wordpress.com/2020/07/31635472668.pdf
    • https://nibefuwubewa.files.wordpress.com/2020/06/gidilikabosezaselenifi.pdf
    • https://dezisekebu.files.wordpress.com/2020/07/fodutosijekaf.pdf
    • https://ridaxaxip.files.wordpress.com/2020/06/17038458285.pdf
    • https://xiwixiligut.files.wordpress.com/2020/06/medaranigus.pdf
    • https://mujirarog.files.wordpress.com/2020/06/40186238704.pdf
    • https://tamotap.files.wordpress.com/2020/07/62038911801.pdf
    • https://zadidepetox.files.wordpress.com/2020/06/5729548654.pdf
    • https://rudukaleditu308957543.files.wordpress.com/2020/06/febegefelapu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/7511922833.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5355/files/lowovij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3215656586.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/jafosipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65022979336.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/favubedezemopazejive.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/61479344345.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/5263455393.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008562.bin
1980b37f61b9be11f2d1936f684bd4b0a123814498e1239f0ed9538bb3800f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8562 5752 bytes
font_01_sfnt_off000098ce.bin
a47d50c77bb2b81885ab26df936d47b2b0c33dd3b3b151d2ec82d12653abcfc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98CE 9976 bytes

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