Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6514f7becc9d8b0…

MALICIOUS

PDF

44.5 KB Created: 2020-08-02 12:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed0906cc1077a9b3f7b62015b1e2f83a SHA-1: 8f975a570825f72b7b8f57146c23af5bf7ad9915 SHA-256: f6514f7becc9d8b0cbe30519d290ea7ba0a7900866dae7a9de204fdd1dfd88db
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though malformed, contains the text 'What is a div in html' and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness, supporting the presence of malicious redirector links.

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=what+is+a+div+in+html
    • http://files.spinna.org/uploads/1/3/2/6/132681559/fc7610adbfa9de0.pdf
    • http://files.sunshinegirlabroad.com/uploads/1/3/1/0/131070646/dakilit.pdf
    • http://files.stephaniecrawfordquilter.com/uploads/1/3/0/7/130775429/wagav-xovatiju-lafitomexivodel-fumira.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/fasisezedir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojedeteremedadedarovir.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/35280446373.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/sindrome_de_asperger_tratamiento_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6430/3516/files/widubunugoxejawigew.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/nizojuzevijanezonilez.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/86116296460.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/50660272136.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/lomabawenowikedotumile.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1623/files/40660164741.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/86554185654.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/9339392968.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_off00005ab4.bin
61ace9651e71fcd4290925b551f49ad4a9ce53028cf7ee303681cfa1039a2ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB4 4600 bytes
font_01_sfnt_off00006a1d.bin
5c59292c40ebb1cefb0667ee1b7b6dbb6910cc2f96ba0c201d5bfc542455ef5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1D 14480 bytes
font_02_sfnt_off00009756.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9756 4324 bytes

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