Malicious PDF — malware analysis report

Static analysis result for SHA-256 60450f51ede73c27…

MALICIOUS

PDF

46.4 KB Created: 2020-07-13 03:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e1b7a9e48042a55b7f103aeafc12948 SHA-1: 610d08fae6b289245a3cff917804e86426b90983 SHA-256: 60450f51ede73c275b142f270bdf20a87c7d4a4bd7c8f39a9e8fb26a418f3a8f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spamming operation. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=social+psychology+baron+and+branscom', is flagged as a malicious redirector, indicating a potential for malicious redirection. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=social+psychology+baron+and+branscom
    • http://files.asthewoodturnzne.net/uploads/1/3/2/3/132302998/simerevafes.pdf
    • http://files.cvdogclub.com/uploads/1/3/0/8/130874018/9410530.pdf
    • http://files.connoisseurstours.com/uploads/1/3/1/8/131857071/abaa266e7dc9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vidawig.files.wordpress.com/2020/07/dajuwit.pdf
    • https://basogobap.files.wordpress.com/2020/07/tepegizokuvemosepuwana.pdf
    • https://bujonen.files.wordpress.com/2020/07/ladaruzasiwipajupofan.pdf
    • https://jesugiresol.files.wordpress.com/2020/07/jizibojidibunavokevezi.pdf
    • https://tufopeg.files.wordpress.com/2020/07/72695491918.pdf
    • https://bofisoj.files.wordpress.com/2020/07/11622995722.pdf
    • https://xekomuzow.files.wordpress.com/2020/06/muxomitupa.pdf
    • https://tudasutenugo.files.wordpress.com/2020/07/9301285051.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80884551140.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/segeserarivazuba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/51205541160.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/98049281828.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/polof.pdf
    • https://cdn.shopify.com/s/files/1/0431/2878/3002/files/66303533014.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_off000076f5.bin
c0ffe78b093f3460cda800694e50eda8fb36c99d7f23c5896579544956bbb6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F5 5424 bytes
font_01_sfnt_off0000890a.bin
bd4da2840f788cfbee45b9007ebdec4d3db0d1624c144f660261d2bc9c3a1dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890A 10192 bytes

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