Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0f2c9eb27820d2…

MALICIOUS

PDF

39.2 KB Created: 2020-07-11 07:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d9ea5cd9374429cc619bd72ac9eaf7f SHA-1: 2a043d667b1cc7454c07db2b367b5e7dd45cb46e SHA-256: 7f0f2c9eb27820d23670f277cdc3f3403bcedcad23f1e38e1a5032805fc5a6ba
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm hosted on disposable infrastructure. This suggests the primary purpose is to redirect users to malicious sites, potentially for phishing or malware distribution.

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.com/pify?keyword=br%25C3%25BCche+addition+erkl%25C3%25A4rung+pdf
    • http://files.sanctuaryandstone.com/uploads/1/3/1/4/131437753/somixizilu.pdf
    • http://files.rockcliffetennis.ca/uploads/1/3/2/3/132303378/187db2a8.pdf
    • http://files.alliedacct.com/uploads/1/3/1/4/131438682/1055338.pdf
    • http://files.match-gems.com/uploads/1/3/0/9/130969243/waruxe-gibotusupuwe-viputefetapaj-walugogigebomev.pdf
    • http://files.fourfeltiefeet.com/uploads/1/3/1/4/131454304/7263657.pdf
    • http://files.oakgrovefoundation.org/uploads/1/3/2/6/132696280/b68654f7134c820.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nilunaruf.files.wordpress.com/2020/06/lerejuvakogaloxes.pdf
    • https://xozigun417683795.files.wordpress.com/2020/06/mukesajurikepila.pdf
    • https://rasozufim.files.wordpress.com/2020/06/2295792369.pdf
    • https://gilukunujor.files.wordpress.com/2020/07/2285048044.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/difepesokexoral.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/84601275710.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/sinogisilef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifezunelavezide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000578c.bin
614e8a9d6ee9c2e2fd60e62d643b9db9f9f429df47446c26aae6a971b79d763e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x578C 5588 bytes
font_01_sfnt_off000069c0.bin
92d5c78bd1007d540e04cb943aeca1fcb5a22346916e2d3e406e572e72fed008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C0 11072 bytes

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