Malicious PDF — malware analysis report

Static analysis result for SHA-256 e817e940692064c6…

MALICIOUS

PDF

43.1 KB Created: 2020-07-09 21:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: d0872940b69d3858033b6f2efae67e38 SHA-1: ecb82024db1b32e9bdfc56169e4b2db84aaee1cb SHA-256: e817e940692064c61bcea6604bb340ed9aa4c7f5015c926b0e01beeedc053aa1
184 Risk Score

Malware Insights

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

The PDF document functions as a link farm, embedding numerous URLs that redirect to external PDF files. The primary URL, 'https://ttraff.cc/wb?keyword=orthodontics%20pdf%20free%20download', suggests a lure for free downloads, likely to distribute malware. The ML classifier strongly indicated maliciousness, and the presence of a redirector link further supports this assessment.

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.cc/wb?keyword=orthodontics%20pdf%20free%20download In PDF document text
    • http://files.myececlass-observe.com/uploads/1/3/0/7/130775654/1407538.pdfIn PDF document text
    • http://files.breastcancerstartupchallenge.com/uploads/1/3/1/1/131163516/9f74ec2a364c.pdfIn PDF document text
    • http://files.moesplace.us/uploads/1/3/1/4/131438234/d4dc9ca.pdfIn PDF document text
    • http://files.thewaveindustries.com/uploads/1/3/1/4/131413837/a1b902b2.pdfIn PDF document text
    • http://files.texashollandlops.com/uploads/1/3/1/3/131379371/7953459.pdfIn PDF document text
    • http://files.amandabeekhuizen.com/uploads/1/3/1/4/131412858/f1437f969.pdfIn PDF document text
    • http://files.rhondastruminger.net/uploads/1/3/1/0/131071076/1562942.pdfIn PDF document text
    • http://files.rockvillehelp.org/uploads/1/3/0/7/130775619/vizisiwigifukis.pdfIn PDF document text
    • http://files.raquelmeraki.com/uploads/1/3/2/7/132740860/3354846.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rotoxepodib.files.wordpress.com/2020/06/gazugegovof.pdfIn PDF document text
    • https://valoranas.files.wordpress.com/2020/06/vazora.pdfIn PDF document text
    • https://nikiruweti.files.wordpress.com/2020/07/gotexemigazikafezam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29121996303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6B 5152 bytes
SHA-256: 20ef507196c4f62e2454c8ec88f507754b53f93bf927b6bce695e8f56b02e7dd
font_01_sfnt_off00007bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF7 10504 bytes
SHA-256: 0d7f8a4bdd94b18bcbf7bae8521283e9e4aab74bed8f79994e6d8ef907520975

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