Malicious PDF — malware analysis report

Static analysis result for SHA-256 136ff339f77fb40d…

MALICIOUS

PDF

41.7 KB Created: 2020-07-11 22:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9c2a0416e6f682db7e6b9058f6ecfaf SHA-1: 30008b7024af9dd7893b3ca691bbebfbbc5a117c SHA-256: 136ff339f77fb40da6fe427325a9dc26f3e7d1d44a23b9b95a57ab061423999e
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 are structured to appear as SEO-optimized PDF downloads. One of these links, https://ttraff.ru/wb?keyword=practice%20of%20brahmacharya%20pdf%20download, is known to redirect to malicious infrastructure. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful sites.

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.ru/wb?keyword=practice%20of%20brahmacharya%20pdf%20download
    • http://files.carriekellyk9.com/uploads/1/3/0/8/130814133/kojenoj-rotifofowovet.pdf
    • http://files.fbcspringhope.com/uploads/1/3/1/6/131606362/fbc30ac3.pdf
    • http://files.mynextbike.com/uploads/1/3/1/3/131397960/zokumifosa_bogeluvur_godilowur_koluvodabune.pdf
    • http://files.mindfullbpc.com/uploads/1/3/1/0/131070098/cea38a52d4e.pdf
    • http://files.aleastviewpta.com/uploads/1/3/0/8/130814189/8022182.pdf
    • http://files.vocabsupport.com/uploads/1/3/1/8/131856382/kizaxero.pdf
    • http://files.practicepraxis.org/uploads/1/3/0/8/130874569/nubusineg-gemumazalo.pdf
    • http://files.parkviewyogaandmassage.com/uploads/1/3/0/8/130813025/detojirirozula.pdf
    • http://files.grovecanada.org/uploads/1/3/2/7/132741181/41fc72a5e26134d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rejutunav.files.wordpress.com/2020/06/6737236974.pdf
    • https://ralowigi.files.wordpress.com/2020/06/14747914116.pdf
    • https://zudarimun.files.wordpress.com/2020/07/rijumexaxepubiwuziwe.pdf
    • https://gofuvefim.files.wordpress.com/2020/06/48275323717.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/musuvagexas.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/vubikenusodarofiluvabep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/dujag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/katitojozuze.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/tejitotapinew.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/dajedumokalizadazipodeg.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_off0000664d.bin
7a10556ce5b7ce8a6497df72116ad7573b8b9fd28e2536b1582be9407953135c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664D 5340 bytes
font_01_sfnt_off0000784a.bin
a1d2064c63e40f9352c25639e54d1f1b313517ea7cce5f42c6784bb187635840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784A 9760 bytes

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