Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f7ffa538c7060f…

MALICIOUS

PDF

45.4 KB Created: 2020-07-09 05:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10e6c1e339c9401eefce71bd0a4f73ca SHA-1: 35eb7a155f220b4c165c3b2173288b0eec8430ef SHA-256: 13f7ffa538c7060ff65cdd0d7bf0d89b196200c114e6c7131bf3f2bb52dc4df0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a malicious redirector and a link farm, suggesting an attempt to drive traffic to potentially harmful sites. The ML classifier strongly indicated maliciousness, and the presence of external links points towards a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/wb?keyword=story%20of%20persephone%20and%20hades%20pdf
    • http://files.dogsndonutstucson.com/uploads/1/3/2/8/132814448/rijaribimuw_muvokowaraza_bikobusize_jater.pdf
    • http://files.vishvasdave.com/uploads/1/3/0/8/130874575/6953187.pdf
    • http://files.icthope.org/uploads/1/3/1/4/131437753/6587094.pdf
    • http://files.mylakehillsreserve.com/uploads/1/3/1/8/131856052/9784b.pdf
    • http://files.gamechangernd.com/uploads/1/3/1/6/131606353/ximebumanuv.pdf
    • http://files.studioplumpiano.com/uploads/1/3/1/3/131383497/70178f76b.pdf
    • http://files.grey-music.com/uploads/1/3/2/8/132815004/3840468.pdf
    • http://files.wellwithart.com/uploads/1/3/2/8/132815753/lefinoribiwewi_tositavabowini.pdf
    • http://files.thewaveindustries.com/uploads/1/3/1/4/131413837/a1b902b2.pdf
    • http://files.ztfe.com/uploads/1/3/2/6/132695333/selevifo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://desesir.files.wordpress.com/2020/07/fimajoketoner.pdf
    • https://kotafozet.files.wordpress.com/2020/07/ravewawalijidaku.pdf
    • https://rupugidov30404460.files.wordpress.com/2020/06/pasapemugesenov.pdf
    • https://rutelewimi605110918.files.wordpress.com/2020/06/vemisiwatugijud.pdf
    • https://wunokal.files.wordpress.com/2020/06/45657931677.pdf
    • https://sefusonuxaj.files.wordpress.com/2020/06/67442111133.pdf
    • https://kuvowiv.files.wordpress.com/2020/06/27638027845.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26450106566.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37357510366.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_off000075c5.bin
9bdd81224860314d756e1366d99471ab7519f9f48288f4846401bfeb3ce5fd9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C5 5040 bytes
font_01_sfnt_off000086d8.bin
ac30b3d35597c5ee16e7e744353fd9698cdd15067ee9b85c50fde12d4dc1aa95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D8 9756 bytes

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