Malicious PDF — malware analysis report

Static analysis result for SHA-256 6615bb0ed425c92f…

MALICIOUS

PDF

39.4 KB Created: 2020-09-12 17:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d3df1236b8c20bb69fc33acb8d3829b SHA-1: 83d094c9450170cff1532decf405e5f5ddf45847 SHA-256: 6615bb0ed425c92fb6b716de8593cef14b8952a0002d8d320a960e4fbf7b904a
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure for a 'free fillable donation receipt template' and embeds multiple external links. One critical heuristic identified a malicious redirector link, https://ttraff.me/wix?keyword=free+fillable+donation+receipt+template, which is likely intended to lead the user to a malicious payload or phishing page. The PDF also contains numerous other links, many of which are algorithmically generated and point to external PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.me/wix?keyword=free+fillable+donation+receipt+template
    • http://files.frenchamericanbiotechspringboard.com/uploads/1/3/1/0/131070846/919cd7d490f5dd.pdf
    • http://files.greenpowersystem.net/uploads/1/3/2/8/132815183/ab302cc9bf17d9.pdf
    • http://zasotex.mgle-germanschool.org/uploads/1/3/2/8/132816066/178335.pdf
    • http://files.omelettecafemanassas.com/uploads/1/3/1/4/131482916/1a477ed0ae8cee8.pdf
    • http://files.outsideincounseling.org/uploads/1/3/1/3/131379380/xivovumedutesawogufu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9605/4690/files/minecraft_dimension_ids.pdf
    • https://cdn.shopify.com/s/files/1/0468/0358/3125/files/30959776201.pdf
    • https://cdn.shopify.com/s/files/1/0431/1774/0199/files/cahier_de_vacances_ce2_vers_cm1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c84bc509c82e4486b3a31c1d0b4ac0c6.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_30f2f99f0753478bb99232832f0d641c.pdf
    • https://static.usrfiles.com/ugd/6e3131_299dea60063743589e2a0ba041676f40.pdf
    • https://static.usrfiles.com/ugd/7be1cd_01ec6a270b5f402f896beff25d6230f4.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_off00005b8e.bin
a659a3ac63bdae19e5b741206034bbcd250c29dae98ef4b94877d8a526d1b80a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8E 5216 bytes
font_01_sfnt_off00006d37.bin
d5028d6f81c52ac6ebc38878e71b7f16e0da3c240a371436e045d04eb4e02e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D37 10500 bytes

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