Malicious PDF — malware analysis report

Static analysis result for SHA-256 65125ceca268459a…

MALICIOUS

PDF

62.4 KB Created: 2020-07-10 15:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 853c242e5648d1bf129ac00568a1850a SHA-1: ade316031679f1f5b3079fd768ea385633affcc5 SHA-256: 65125ceca268459a5b59489d9388b0c2c07a230e25e7779c4eab06faecb54553
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate this is likely part of an SEO link farm or a phishing campaign. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wb?keyword=excel%20vba%20pdf%20sheet
    • http://files.postplumbingheatingandair.com/uploads/1/3/0/8/130813409/fc6987d96b.pdf
    • http://files.antoniosajid.com/uploads/1/3/1/4/131409244/2c919441f45.pdf
    • http://files.bitmathedu.com/uploads/1/3/1/0/131071035/wovewo_noropotuji.pdf
    • http://files.artintheiron.com/uploads/1/3/0/7/130776812/fe7aec0eb8501.pdf
    • http://files.melissagunasena.com/uploads/1/3/1/4/131438468/josobivituraki.pdf
    • http://files.thematic-learning.org/uploads/1/3/0/7/130738830/sejeti.pdf
    • http://files.thehistoricallouezsociety.org/uploads/1/3/1/8/131857193/jitufutiluwagezogen.pdf
    • http://files.7devilsbrewery.com/uploads/1/3/0/7/130775870/dozekofexuwur_faxisinapo.pdf
    • http://files.marinesmemorial5k.com/uploads/1/3/1/0/131071035/4095726.pdf
    • http://files.freeartistmutualaid.com/uploads/1/3/0/7/130775192/5c2e8.pdf
    • http://files.eusmiliabeauty.com/uploads/1/3/0/9/130970001/fa791b18cb3cbb6.pdf
    • http://files.benjhomes.com/uploads/1/3/1/4/131438570/2073772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kataxufekor.files.wordpress.com/2020/07/41879850891.pdf
    • https://woxaxivebaj.files.wordpress.com/2020/07/46624062556.pdf
    • https://susikebe.files.wordpress.com/2020/07/50848408108.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/laneguwabasezurugiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/birusuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/zojexag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wirokole.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_off0000b953.bin
502a6ac5282d37f10a5d9fb3f5dfe4d87b942a3ff7749c8afc883b301b5250e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB953 4896 bytes
font_01_sfnt_off0000ca0b.bin
5507fe04a43092fedae001c8589c798d5c9815c12afe4a6c1f379e6fe53c0c5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 10028 bytes

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