Malicious PDF — malware analysis report

Static analysis result for SHA-256 854fb998690a59d4…

MALICIOUS

PDF

49.6 KB Created: 2020-09-17 19:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ebf82fc71ed34bc1ff46cea60fd6361 SHA-1: 7b1695d2b71fb60d5c5fa04494f8a99e38bb0ce1 SHA-256: 854fb998690a59d4124e5bdc57f473e31ac28e6dcca8dc98952d4ca20d9b90ac
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The document body, though heavily obfuscated, contains URLs that are also present in the extracted URL list. The primary purpose appears to be directing users to external, potentially malicious, web content.

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.club/wix?keyword=the+road+themes
    • http://files.dishndames.com/uploads/1/3/0/7/130738719/sawokifode_xikiwoxupino.pdf
    • http://files.morganadvisory.net/uploads/1/3/0/8/130874120/tijojugoboget.pdf
    • http://files.3dhdmodels.com/uploads/1/3/0/7/130776327/jonodotizim-gimos.pdf
    • http://files.pcrba.org/uploads/1/3/1/4/131453255/mipuluz_fapenexeli_zemiseg_tosebabiv.pdf
    • http://gapet.sbrackenridgelcsw.com/uploads/1/3/1/3/131383386/25b216.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6974/4028/files/71462015337.pdf
    • https://253fe20a-55a8-4185-a65c-fe41097f11fe.filesusr.com/ugd/60ffa2_1511e22ab5804dfb86d078ee9792a59b.pdf?index=true
    • https://ad956cd5-da4f-4524-9672-aea952d14cd3.filesusr.com/ugd/0df15e_9ed649ede89a463895d4984f9ae8b95d.pdf?index=true
    • https://3d438a88-385d-483c-a616-cbd4c6e2b940.filesusr.com/ugd/3d0627_f803351745d84990870b0736ccbacbbe.pdf?index=true
    • https://c8f4eff3-f5d2-4c7f-80f5-3507bd0032ce.filesusr.com/ugd/784815_d3a16e5faf5548ae94a14443ce645299.pdf?index=true
    • 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_off0000860b.bin
6497f103af90b6321f3a27ece103d7398cf7c2df0230d8bb554550a323e264d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x860B 4984 bytes
font_01_sfnt_off000096c9.bin
27a010a53460fb718ffcc2b7e44ff4c36569f5a180057c47baa08ebae0f67dae
pdf-font-stream PDF embedded font (sfnt) at offset 0x96C9 10404 bytes