Malicious PDF — malware analysis report

Static analysis result for SHA-256 655a240083302a93…

MALICIOUS

PDF

42.7 KB Created: 2020-08-09 09:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9d405442f8f99cb02965af869a2a675 SHA-1: bb03b03f0edde8b151f51172ad408420f5b29f3c SHA-256: 655a240083302a9303c7b74dbd7409608ee380e492bb5e6a1f6c3fb43b34c3f7
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 point to external resources, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to serve the lure 'Angeles y demonios libro pdf descargar gratis'. The ML classifier also strongly indicated maliciousness.

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=angeles+y+demonios+libro+pdf+descargar+gratis
    • http://fabuweda.mrhairphysed.com/uploads/1/3/2/6/132695569/1062064.pdf
    • http://files.dianeperell.com/uploads/1/3/1/4/131453645/vebesukezofonev.pdf
    • http://wamota.babbiemuseum.org/uploads/1/3/1/6/131606027/siwubefukumul_tamukigadasotej_fotun_pagizaworu.pdf
    • http://files.missionographer.com/uploads/1/3/1/4/131437117/wudunuzuba_zaxixesubo_tujikod_zikesedegida.pdf
    • http://jadilodek.hipointlabs.com/uploads/1/3/0/7/130738524/85bef4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/48897262745.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/febawetojefodilotezovovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8720/files/como_aprender_libras.pdf
    • https://cdn.shopify.com/s/files/1/0431/8029/4298/files/35593440207.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7626/files/webm_to_mov.pdf
    • https://cdn.shopify.com/s/files/1/0433/4570/7166/files/89102494881.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6724/files/retoli.pdf
    • https://cdn.shopify.com/s/files/1/0437/8751/8104/files/votinelejufebo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1288/1564/files/buferanikupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/ascii_table_special_characters.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_off000063e9.bin
767ad9552c309ca4d1b3ae0f4430a4bc637fe6dd4ec1c2ae11440b3a41f3036f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E9 5708 bytes
font_01_sfnt_off00007748.bin
69fbc040125d4b65883f10263cb2cf90520276c9eb72dc2ae6c2f8f1ed310fee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7748 11152 bytes

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