Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eac59d2e9b2eeb4…

MALICIOUS

PDF

53.0 KB Created: 2020-07-09 22:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1514dbe07a43645c0b39617e661c313 SHA-1: 5639ead65064c280d6a70e2074b87c74a7ac377b SHA-256: 5eac59d2e9b2eeb47ceb9e1fe52bc6c4195c6b03936593b9d203372b5cd7ce56
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms and redirectors, indicating a malicious intent to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external links suggests the document's primary function is to redirect users, likely as part of a phishing or malware distribution scheme.

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=stroboscopic%20effect%20and%20methods%20to%20reduce%20pdf
    • http://files.goodstuffprimaryresources.com/uploads/1/3/2/6/132681204/lamumolop.pdf
    • http://files.curvychickff.com/uploads/1/3/2/7/132741128/6f0f5.pdf
    • http://files.totalbodybeautiful.us/uploads/1/3/1/3/131378779/fidobatibi_dikizotukid.pdf
    • http://files.limassolsportsmassage.com/uploads/1/3/0/8/130874129/laxuvovobopekidom.pdf
    • http://files.portagewarriorfb.com/uploads/1/3/1/3/131380467/465b2d56b15c5d.pdf
    • http://files.troubadourtheatrecollective.com/uploads/1/3/1/3/131398517/gineregeb_wosoxofij.pdf
    • http://files.randallcb.com/uploads/1/3/1/6/131606335/duseleje.pdf
    • http://files.sportseconomics.org/uploads/1/3/2/3/132302966/8686491.pdf
    • http://files.fustlerthefemalehustler.com/uploads/1/3/0/7/130739839/gaxiwoloxakutenuboj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gilolarezuj.files.wordpress.com/2020/07/zosakipilegapenopar.pdf
    • https://razekusokil.files.wordpress.com/2020/06/70433080933.pdf
    • https://rutelewimi605110918.files.wordpress.com/2020/06/vemisiwatugijud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30106301206.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevaziretojigadogikoranab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zurutadodusabexefiba.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b76.bin
f87e03bb28f6d62a9be43d9713e6b045b2d9824fc8ca2bdc5cfef69c397156c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B76 5488 bytes
font_01_sfnt_off00008dd9.bin
d56343befbfb34c96d3de831204b760adeda7f2dcc5f263e8b86a42fee5ed73c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD9 10436 bytes
font_02_sfnt_off0000b1b8.bin
23e5e0a6ad5360bf10628433507e5aab34c42d7d900ccb2a5214949f2168b422		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B8 16112 bytes

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