Malicious PDF — malware analysis report

Static analysis result for SHA-256 f429cd4548d5ddf5…

MALICIOUS

PDF

42.0 KB Created: 2020-07-08 22:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 3148d848b8c8ceb03e0f2a0d2353981b SHA-1: 54b41ddbdf99df1a83e7449b003e0ee56ab0e708 SHA-256: f429cd4548d5ddf5115d62f1b54315f53d56da34389178eb8a8dcbbd19b2020d
192 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link redirects to `https://ttraff.com/wb?keyword=up%20board%20class%2010th%20time%20table%202019%20pdf`, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains similar URLs, suggesting a coordinated effort to drive traffic to potentially harmful sites. The presence of a visual download button further supports the lure-based attack pattern.

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=up%20board%20class%2010th%20time%20table%202019%20pdf In PDF document text
    • http://files.bellacalore.com/uploads/1/3/0/8/130814279/mumubimogamu-fupedevumebat-ropetiwajo.pdfIn PDF document text
    • http://files.marra.cosmo-ufes.org/uploads/1/3/0/7/130739120/9703018.pdfIn PDF document text
    • http://files.manzanitaspreschool.org/uploads/1/3/2/7/132740564/welasufakuv_judogug_zenubogama_xuditoro.pdfIn PDF document text
    • http://files.poppyavenueboutique.com/uploads/1/3/1/3/131398177/4928542.pdfIn PDF document text
    • http://files.creativecounselingsrq.org/uploads/1/3/2/7/132710787/5366484.pdfIn PDF document text
    • http://files.wilmingtonprintandmail.com/uploads/1/3/1/6/131637057/cd8bc305482.pdfIn PDF document text
    • http://files.kristinsurak.com/uploads/1/3/0/9/130969427/5866122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sunederaxi406707068.files.wordpress.com/2020/06/nipedukijidaxaj.pdfIn PDF document text
    • https://wasigamolo.files.wordpress.com/2020/06/pasowoki.pdfIn PDF document text
    • https://mopebafuju.files.wordpress.com/2020/06/54371086771.pdfIn PDF document text
    • https://ferularode.files.wordpress.com/2020/07/ketawefi.pdfIn PDF document text
    • https://famexuzin.files.wordpress.com/2020/06/nibalorepiboxipiniwuw.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/1/0428/9835/8432/files/totavari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6540 5692 bytes
SHA-256: f0673f64a8f80a156d8acd7c58e53c7836f09444ddd1a5b45ba771cb376dae74
font_01_sfnt_off00007895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7895 10152 bytes
SHA-256: dfea778453e65accbcc5a0f65cb40eb41a6f5d2dd487f090c1d263538b8fe7c2