Malicious PDF — malware analysis report

Static analysis result for SHA-256 7346e5a8877f3609…

MALICIOUS

PDF

42.7 KB Created: 2020-09-16 22:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00d53d8dde100bef33e5c4faaa50f42a SHA-1: f59a4cdcd2517cd008ce01fdcb3c9ebb5936a6d7 SHA-256: 7346e5a8877f360926b37a36a329884fb608ddea9529fd0615123ff67f027e8e
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable domains and are structured in a way that suggests SEO manipulation or a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=towelroot+apk+4.0'. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous PDF links and a redirector URL indicates a high likelihood of malicious intent, possibly to distribute further malware or engage in phishing.

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/wix?keyword=towelroot+apk+4.0
    • http://files.biketheswell.org/uploads/1/3/0/7/130738534/3583144.pdf
    • http://files.mauvebranddesigns.com/uploads/1/3/1/6/131606431/fulanudu.pdf
    • http://butup.juliamorizawa.com/uploads/1/3/1/4/131483112/butegeliputal.pdf
    • http://waxifomed.theputtingsquare.com/uploads/1/3/1/4/131437130/93db0a0e1cc2.pdf
    • http://zuposepu.reginastarkgallery.com/uploads/1/3/1/1/131164557/830c4fa2.pdf
    • http://files.coolmedicalspa.com/uploads/1/3/0/7/130775515/937446c74026.pdf
    • http://turatuza.hartlandcommunitychapel.org/uploads/1/3/2/6/132695351/rufamaz.pdf
    • http://padurotut.incubator143.org/uploads/1/3/1/3/131379394/4068087.pdf
    • http://ruvup.thebluenoteringos.com/uploads/1/3/1/4/131438096/lugawa.pdf
    • http://lulidexo.slictaillights.com/uploads/1/3/1/0/131070841/1495414.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4901/5713/files/jazugodezoxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://8347e82f-fc3f-457f-9ac5-1d7e629de248.filesusr.com/ugd/bfbc46_47e6243074824f0f89135cdef76ce442.pdf?index=true
    • https://989acd6b-5353-4dcb-a821-44757b0eb34e.filesusr.com/ugd/5c9621_feb4b5f42f334580974f4cf992560604.pdf?index=true
    • https://580cf127-c46c-4e7b-95f3-978bf6d46972.filesusr.com/ugd/384ea4_50c7c8cdeca44afd912769046b84c396.pdf?index=true
    • https://fd995576-5013-4f83-9442-9b752a0a3498.filesusr.com/ugd/0582e0_704bcf1984434ddab7ee0b17d0f40bc9.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_off00006a7f.bin
747c931e4a15efe947d027eca150d88949ea1fa11ea9ac0d1ed7f3e8699007af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7F 5000 bytes
font_01_sfnt_off00007ba8.bin
cb85c92dfcf753e7603086703a95acef146aa4910f6ca9b4363c5fd62ebe9b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA8 10104 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.