Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c96238868891590…

MALICIOUS

PDF

33.4 KB Created: 2020-08-21 15:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f657c7e66ba720c8691d7661692c840d SHA-1: 9c45069f7e9a03b1bd6fcd0bdaf14961f21b9f8d SHA-256: 1c962388688915908a03f3a709af3bd97f7f213345508296f9b3618d76885add
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links, many of which point to a redirector service. This suggests the document is designed to lure users to malicious websites through a chain of redirects. The primary malicious IOC is the redirector URL.

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=maryland+tour+guide
    • http://files.kathrynpentecost.com/uploads/1/3/1/3/131383549/demur.pdf
    • http://mekis.cosmicrockbooklets.com/uploads/1/3/0/7/130740178/8391091.pdf
    • http://files.shayaanacademy.com/uploads/1/3/1/1/131164100/pinamokidiniwesub.pdf
    • http://files.caribbeancare.org/uploads/1/3/0/8/130874278/zaxif_risisulu_jowegadez_juleteb.pdf
    • http://files.texashollandlops.com/uploads/1/3/1/3/131379371/7953459.pdf
    • https://cdn.shopify.com/s/files/1/0435/0106/0262/files/pdf_to_editable_word_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://cdn.shopify.com/s/files/1/0435/0240/3750/files/31075527111.pdf
    • https://cdn.shopify.com/s/files/1/0434/0137/9996/files/lukanijunuripaxategepu.pdf
    • https://cdn.shopify.com/s/files/1/0441/3505/5512/files/apna_time_aayega_video_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0430/6773/6225/files/99084496089.pdf
    • https://cdn.shopify.com/s/files/1/0429/3145/4119/files/dudure.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/30306269474.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7403/5607/files/datasheet_mosfet_irf630.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000470b.bin
0aa7b1f19fd02357d6c494cbd0a0458a35b2d795b879a2ede350fd3682e79764
pdf-font-stream PDF embedded font (sfnt) at offset 0x470B 4924 bytes
font_01_sfnt_off000057de.bin
9a6206e8698f5880ff4756e73c51415901fcf22a25ad4eafc832549240180b4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x57DE 9732 bytes