Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e59ef285940377…

MALICIOUS

PDF

44.8 KB Created: 2020-08-11 20:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1ce9ebddb11e26fb2fffe6d4dbd02dc SHA-1: c651c550ec7c461b59b46b6ebae512e39e7a923a SHA-256: 81e59ef2859403777a27febf385dfba826dbb246a885ed16a4b418e72f4fede7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to a known malicious redirector. The primary malicious link identified is https://ttraff.cc/pify?keyword=giardia+lamblia+caso+clinico+pdf. The document's structure and content suggest it is part of a link farm designed to drive traffic to malicious sites, likely for phishing or malware distribution.

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=giardia+lamblia+caso+clinico+pdf
    • http://files.124line.com/uploads/1/3/1/4/131438313/fd6a287b89376b.pdf
    • http://jifal.amberlynnphotographyllc.com/uploads/1/3/0/8/130874655/tabovulowivodotopi.pdf
    • http://files.switchbricks.com/uploads/1/3/1/3/131384185/duxifotubuwu_warinafuturewu_tovewujapenir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/van_mccoy_the_hustle.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7643/files/starting_a_discord_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/9160/8227/files/91207782135.pdf
    • https://cdn.shopify.com/s/files/1/0431/3769/5895/files/62968291212.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/importance_of_working_capital_management.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/networking_devices.pdf
    • https://cdn.shopify.com/s/files/1/0428/1758/5308/files/sejarah_agama_yahudi_abdul_somad_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4842/0007/files/kuxiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/81962851061.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/gebuzurofejinisaduniwezen.pdf
    • https://cdn.shopify.com/s/files/1/0438/4076/6109/files/zijewuki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000650a.bin
c6f840f08335b0fcfdc754d2c9f4d794cacd87108af31d432a64a21684f6f582		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650A 5064 bytes
font_01_sfnt_off00007612.bin
ac3542503731748a80952c5a25cf34d12d4ee7ef6dd9c0453fe774bb9f1022d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7612 10076 bytes
font_02_sfnt_off00009872.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9872 4324 bytes

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