Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b4b734e1261c99…

MALICIOUS

PDF

34.9 KB Created: 2020-08-02 22:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ad36ff68455b400c2bb269b0d039210 SHA-1: 973c58affd514bac5b87c07239dc6792019f9865 SHA-256: 88b4b734e1261c9948aff2da2786b89255460a48357da69f30ae62a0778302be
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the same malicious URL and benign-looking PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector points to an attempt to lure users to harmful content.

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=songs+from+lilo+and+stitch
    • http://files.diamondlfeedandtransport.com/uploads/1/3/1/4/131453486/389712.pdf
    • http://files.njmsxc.com/uploads/1/3/1/6/131636689/lojovek.pdf
    • http://files.stbindymusic.com/uploads/1/3/1/4/131411762/79e6b140.pdf
    • http://files.totaltravelsystem.com/uploads/1/3/0/8/130814680/8321069.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/bujuwemugexowonapufuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/6663542267.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/23542409803.pdf
    • https://cdn.shopify.com/s/files/1/0438/1750/0834/files/mamawijuzusaboxejewas.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/undo_git_add.pdf
    • https://cdn.shopify.com/s/files/1/0431/5945/3860/files/43883400356.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/fikofejowaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/zapefifosekuluruvokakij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demajez.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/fapogusibol.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/gosilij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/zuzufapesijemarozuva.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/saxuxadadutus.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_off00004a74.bin
bf64b7ba04b781be34304ae506c8b325a9a3ec3e1937975d39830af800092e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A74 5540 bytes
font_01_sfnt_off00005d19.bin
dfe37c5a917794e5468b9c6145936e24f43e7ed5f9cd4974914d57f60dba5e54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D19 9868 bytes

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