Malicious PDF — malware analysis report

Static analysis result for SHA-256 8508cceb104c3a63…

MALICIOUS

PDF

57.7 KB Created: 2020-07-08 12:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b66159d10c0f2266e839a296d251513 SHA-1: 836e56096ad0462c5bc0ad1b0e44879c3852c7a3 SHA-256: 8508cceb104c3a63018d946141042be34daeecd51a8e1b4d482f086cfe623269
184 Risk Score

Malware Insights

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

The PDF file contains a large number of links to external PDFs hosted on disposable domains, a common tactic for SEO poisoning and potentially distributing malicious content. One of the embedded URLs, 'https://ttraff.cc/wb?keyword=tamil%20baby%20boy%20names%20with%20numerology%20and%20meanings%20pdf', is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=tamil%20baby%20boy%20names%20with%20numerology%20and%20meanings%20pdf
    • http://files.blackriverquarries.com/uploads/1/3/0/7/130775053/wadifobija.pdf
    • http://files.paiboon.biz/uploads/1/3/1/4/131406762/1208977.pdf
    • http://files.progressivefutures.com/uploads/1/3/2/7/132710782/4690789.pdf
    • http://files.sgionet.com/uploads/1/3/0/8/130874413/zujojunejiguwimurob.pdf
    • http://files.spoletogreenfun.org/uploads/1/3/0/7/130775053/f229d5458b04d1.pdf
    • http://files.mysaddlefitter.net/uploads/1/3/1/1/131163563/pebajitef.pdf
    • http://files.breathewithlauren.com/uploads/1/3/1/4/131437351/424db3.pdf
    • http://files.thevirtualink.com/uploads/1/3/1/3/131381802/wewidol.pdf
    • http://files.schec.net/uploads/1/3/1/8/131871894/6851944.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://womazujixix.files.wordpress.com/2020/06/49505371923.pdf
    • https://sanolosu.files.wordpress.com/2020/06/34410038092.pdf
    • https://samedemumut.files.wordpress.com/2020/06/11207551189.pdf
    • https://buporuxewapi.files.wordpress.com/2020/06/zevavunonub.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
stream_003_off0000903a.bin
7a398f4f39743193296de9fe13aaf97b5482f8a130b9d2e694f3416a2dcf677b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x903A 10684 bytes
font_00_sfnt_off00007d43.bin
e64783fac4e6cb8818deb62c465e6ac8488710322fc8ded8b2d4e557a199f094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D43 5620 bytes
font_02_sfnt_off0000acb5.bin
4f1b945f4e3715fe5445c88268915cee515644e8de35b90a7f0ebbb9302af764		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACB5 14512 bytes

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