Malicious PDF — malware analysis report

Static analysis result for SHA-256 594ddef8538fe268…

MALICIOUS

PDF

38.7 KB Created: 2020-07-09 21:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 97b911581cb14a037a5c9a557f589c10 SHA-1: ab0ceb82521bfc71195eee321241bad31f546637 SHA-256: 594ddef8538fe2687786f7a0b0ef41320aeb171132c054311af24891caeda1af
184 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple links pointing to potentially malicious redirectors and file hosting sites. The primary link identified is `https://ttraff.com/wb?keyword=capitalization%20and%20punctuation%20worksheets%20grade%208`, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains similar URLs, reinforcing the malicious intent of directing users to external resources.

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/wb?keyword=capitalization%20and%20punctuation%20worksheets%20grade%208 In PDF document text
    • http://files.newclearrain.com/uploads/1/3/1/8/131855992/5820839.pdfIn PDF document text
    • http://files.evolveastrology.com/uploads/1/3/1/4/131409508/a6526042ad.pdfIn PDF document text
    • http://files.packtenna.com/uploads/1/3/1/4/131482930/4181662.pdfIn PDF document text
    • http://files.frankhagancontracting.com/uploads/1/3/2/6/132681404/zatamutofineve.pdfIn PDF document text
    • http://files.snowypeaksoap.com/uploads/1/3/2/3/132302973/a7512c13cdce8e.pdfIn PDF document text
    • http://files.simplicityaccountingllc.com/uploads/1/3/2/8/132816066/tepipagikelitefalexo.pdfIn PDF document text
    • http://files.johnblanke.com/uploads/1/3/1/4/131453725/70573fbba25.pdfIn PDF document text
    • http://files.mestizostacos.com/uploads/1/3/1/4/131453823/jowubap.pdfIn PDF document text
    • http://files.bestoftimeswatch.com/uploads/1/3/1/3/131379749/e4facd24be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sirozujulad.files.wordpress.com/2020/07/ziluparovag.pdfIn PDF document text
    • https://raxebovar.files.wordpress.com/2020/07/noxiroxozevijofo.pdfIn PDF document text
    • https://butuvifivi.files.wordpress.com/2020/07/32391951732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72645751706.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mikawewetekiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerivavegexem.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_off000058b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58B1 5640 bytes
SHA-256: ab6e5f7fc5ce66284ef7722000fa4fcffa5a327738684aed609aa533b5f0e589
font_01_sfnt_off00006bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BED 9972 bytes
SHA-256: 80fbbd7bbcef54afe65458722064db0d21850372d127abe6b5068db90d32c0e1

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