Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdfcbad86412b58…

MALICIOUS

PDF

81.6 KB Created: 2020-07-30 01:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd33039b91c274e9ce17b3854a7437a7 SHA-1: 2a1db9403ff9af6831c948c7ba00a1a7caa595f9 SHA-256: 7bdfcbad86412b58a3e832930ad3a13808c16f959f7862731258032585c3d654
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 pointing to Shopify domains hosting other PDFs, which is indicative of a link farm designed to obscure malicious redirectors. The primary malicious URL identified is a redirector that leads to further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=10th+maths+guide+pdf+download+2020
    • http://files.jenniferhayesstl.com/uploads/1/3/1/4/131407233/piwabekine.pdf
    • http://files.littletonpreschool.com/uploads/1/3/1/4/131409244/filibefuxedewugudav.pdf
    • http://files.butteswcd.org/uploads/1/3/2/7/132740814/redexokinuz.pdf
    • http://files.pd-parenting.com/uploads/1/3/0/7/130739704/2960027.pdf
    • http://files.mikeslea.com/uploads/1/3/1/3/131379384/1e22a7e.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/favararizikimuleta.pdf
    • https://cdn.shopify.com/s/files/1/0441/2165/3400/files/kabokezabifisem.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/zojazopifolinoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/21856958163.pdf
    • https://cdn.shopify.com/s/files/1/0431/6797/3538/files/jixexisevoxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/xutewurivavix.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/sutokopumizabe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2070/files/gafuforuja.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/zelexote.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/velokiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/4209/2694/files/35402206229.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000de80.bin
e352dcd01dde5107aadf92637cb34440926f3a3f1725c524ff9ebc192e8d8de9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE80 19952 bytes
font_00_sfnt_off0000cba5.bin
b40af301317d333f9ddf64f3c4c25b977c5b70bea43eb2de49a1de58813d43c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA5 5564 bytes
font_02_sfnt_off000109c3.bin
319b6fe72cbe20e55342bdd1e1ba08a3a735284879ea83a7173b77970f1a6893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 10088 bytes
font_03_sfnt_off00012c64.bin
a12908a88df35a7e9eb57470e9a94a806bb52df392ce88a62d07cba2b79b9044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 2832 bytes

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