Malicious PDF — malware analysis report

Static analysis result for SHA-256 a542d7c5b382bc32…

MALICIOUS

PDF

44.9 KB Created: 2020-07-10 04:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: caccf738949a685db1f597bc29b64326 SHA-1: 3710dba4312f70fa55bc5b3462d4e7a0230cc0a5 SHA-256: a542d7c5b382bc3240897f781a8ea80a56123d5e893d83d0324432c0349aa93f
184 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various external files. One URL, 'https://ttraff.ru/wb?keyword=las%20batallas%20en%20el%20desierto%20en%20ingles%20pdf', is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains text related to 'Las batallas en el desierto en ingles pdf' and mentions the wkhtmltopdf tool, suggesting a lure for users searching for this content.

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.ru/wb?keyword=las%20batallas%20en%20el%20desierto%20en%20ingles%20pdf In PDF document text
    • http://files.jrrobsonathletics.com/uploads/1/3/0/7/130775111/xebasujogamo.pdfIn PDF document text
    • http://files.modernmamasgroup.com.au/uploads/1/3/0/7/130739007/6683639.pdfIn PDF document text
    • http://files.standrewlutheranportsmouthva.com/uploads/1/3/1/4/131405940/a8c42e82ac1e4c.pdfIn PDF document text
    • http://files.nducuwangugi.com/uploads/1/3/0/9/130969555/gimuviri-megatanizus-selusifo.pdfIn PDF document text
    • http://files.bilingualbutterflies.com/uploads/1/3/0/7/130739120/b34b665385df1b.pdfIn PDF document text
    • http://files.vinesband.info/uploads/1/3/2/3/132303151/fonidavefed.pdfIn PDF document text
    • http://files.repa-program.org/uploads/1/3/2/8/132815207/fuxuwafoxaj.pdfIn PDF document text
    • http://files.sacpb.org/uploads/1/3/1/3/131383848/gowakakeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lorabipuv.files.wordpress.com/2020/06/30987463148.pdfIn PDF document text
    • https://kateminani.files.wordpress.com/2020/06/wokeferabonezesakazowikiw.pdfIn PDF document text
    • https://taxasegino.files.wordpress.com/2020/06/sajoviwo.pdfIn PDF document text
    • https://magapabiv.files.wordpress.com/2020/07/kudur.pdfIn PDF document text
    • https://pobizabaj.files.wordpress.com/2020/06/9118009326.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25696514874.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_off00007032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7032 5076 bytes
SHA-256: 8e2ce98876066e1abeb6968447d6fbb2259cf00fffd06ba26e455a738e0e3d36
font_01_sfnt_off00008173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8173 10836 bytes
SHA-256: 869e2d0d94a621ef6917611e45e778d105b7571bc94937a0437d67c2ebb2f188

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