Malicious PDF — malware analysis report

Static analysis result for SHA-256 194139384ffdce6c…

MALICIOUS

PDF

44.9 KB Created: 2020-08-24 13:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 091c24f94ebb530732f6108174c7f661 SHA-1: a890b417f3474807c00befa9e5f6c1d6c76a0538 SHA-256: 194139384ffdce6cf4dae26ad5c6350ba6e68f903aeacaeb813cee1df7141eaa
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=heart+failure+management+guidelines+2018', which is a known malicious redirector. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=heart+failure+management+guidelines+2018
    • http://files.bikewashtenaw.org/uploads/1/3/1/0/131070207/togusidusokuj.pdf
    • http://files.vomhiddencreek.com/uploads/1/3/1/6/131606127/kukuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6890/6906/files/poporegagulonigopefuwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/befegurazikikomibolok.pdf
    • https://cdn.shopify.com/s/files/1/0462/9053/4561/files/29844438076.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bagubiginapir.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/40962782915.pdf
    • https://cdn.shopify.com/s/files/1/0434/5485/7369/files/a_practical_course_in_british_english_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/36206441296.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/91361311882.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/gevona.pdf
    • https://cdn.shopify.com/s/files/1/0431/6400/8610/files/lekedenij.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/fumagagoxumevibufi.pdf
    • https://cdn.shopify.com/s/files/1/0452/2449/3213/files/9742942184.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_off0000707a.bin
d24374a02b9ad8b7b6ccf97b26c5ed1124984da8f22c27c97ee9915a2ab9d351
pdf-font-stream PDF embedded font (sfnt) at offset 0x707A 5708 bytes
font_01_sfnt_off000083c1.bin
eae8d610ec566a6b745b482d8e61723db4b9ecc10f7fd3b8c3b5c9346a7b46fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x83C1 10372 bytes