Malicious PDF — malware analysis report

Static analysis result for SHA-256 423731c573959815…

MALICIOUS

PDF

78.2 KB Created: 2020-07-09 23:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a1123ab82c4cd1f0093428d107bcbf1 SHA-1: 19cd7c71ee88bd7100a04737cf1b5dd4b2f5fadc SHA-256: 423731c5739598151809c66fd36c2fb90a4dba8ff84489215f1b88ced46e66f5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with redirectors or link farms. The primary lure appears to be related to 'cyclometric chart pdf', directing users to a malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm.

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=cyclometric%20chart%20pdf
    • http://files.cailenfu.com/uploads/1/3/1/4/131437444/rutez_wubusaxofab_kajali_zuwogor.pdf
    • http://files.fernturnerhair.com/uploads/1/3/1/4/131437147/zijegofajekoxalo.pdf
    • http://files.pacehighchoir.com/uploads/1/3/1/8/131871891/2056809.pdf
    • http://files.omanroadshow.com/uploads/1/3/0/7/130776841/kasulojemuv.pdf
    • http://files.kitalerafiki.com/uploads/1/3/0/8/130873830/kovov_tefusegojiwenav.pdf
    • http://files.behappypiecompany.com/uploads/1/3/1/6/131607023/vulusatibepom_gisakuzil.pdf
    • http://files.williammonaguenativeart.com/uploads/1/3/0/7/130739747/vunidegote.pdf
    • http://files.treasureu.net/uploads/1/3/2/7/132741194/4439739.pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • http://files.treasureu.n
    • https://xovezuxa802976098.files.wordpress.com/2020/06/zizodaluwabigijimugukin.pdf
    • https://nusarufo.files.wordpress.com/2020/07/2383922624.pdf
    • https://xewoxus.files.wordpress.com/2020/07/satadofiro.pdf
    • https://lodefijijulu.files.wordpress.com/2020/06/54611046779.pdf
    • https://pekuseni.files.wordpress.com/2020/06/11326193572.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55628578329.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94260126358.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31492874922.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lasuzopaxikabade.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_off0000ec46.bin
1ffcf7a9640a041e917008141b0e0276dc2740d7bafc6a1c482f17e5896329e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 5024 bytes
font_01_sfnt_off0000fd60.bin
a28c2a9b713ea3253b507bfdef380b90a1421f4ee60a8c49b9aea83e0393056d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 14808 bytes

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