Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bae4624414e7a2…

MALICIOUS

PDF

44.7 KB Created: 2020-08-10 12:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89b04a7e51ec696c3391a2ca1e1863c3 SHA-1: e3b259ad9cbd5bd35e34b3a91c2deabb931b3dcd SHA-256: 13bae4624414e7a2a5d249c870749e9783a5095949ed07b3273ab5be8a7c6ec8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination. The ML classifier 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.ru/pify?keyword=biohazard+waste+management+pdf
    • http://menum.flowingwellsgirlsbasketball.com/uploads/1/3/0/9/130969723/1977695.pdf
    • http://files.nkcecc.com/uploads/1/3/0/9/130969003/kiziwekovureniw.pdf
    • http://files.rotaryseymour.org/uploads/1/3/1/4/131437636/52e18.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8794/4094/files/josaledag.pdf
    • https://cdn.shopify.com/s/files/1/0434/4591/1709/files/2367155554.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7632/files/9773135178.pdf
    • https://cdn.shopify.com/s/files/1/0447/1826/0377/files/mkv_to_mp4_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/pifemarutelobom.pdf
    • https://cdn.shopify.com/s/files/1/0435/8212/8291/files/badoo_premium_apk.pdf
    • https://cdn.shopify.com/s/files/1/0451/7996/1495/files/32348890310.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/nidegalefidun.pdf
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/63525037972.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/16939571781.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/wekudulapokipita.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_off00006364.bin
9a9447a68c841a80b364ed428db15da127240eab11d55f0bc35bffc325122390
pdf-font-stream PDF embedded font (sfnt) at offset 0x6364 5400 bytes
font_01_sfnt_off000075b7.bin
8c28247f26e9e8a22fec729d1a507bfcb813b6aa53eca261e5e176e1b08a3a70
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B7 10068 bytes
font_02_sfnt_off0000981b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x981B 4324 bytes