Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28472dc89ac9eda…

MALICIOUS

PDF

39.0 KB Created: 2020-08-15 23:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 153d7cb5beff6ef3df32670df22516b2 SHA-1: 8b230ce8c31392044f056ea29c7bd5be57a51b10 SHA-256: c28472dc89ac9eda59a89407cd8671eed013ee92cf83a7e000a8177625a09be8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though obfuscated, contains the text 'Pdf krause dietoterapia' and the URL 'https://ttraff.ru/wb?keyword=pdf%20krause%20dietoterapia', suggesting a lure to a malicious site. The presence of a link farm further supports the 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.ru/wb?keyword=pdf%20krause%20dietoterapia
    • http://files.vjbm.com/uploads/1/3/1/3/131380482/2008404.pdf
    • http://files.chaseaturner.com/uploads/1/3/1/4/131482944/xiweliza_legose_pogagunesilov_sopupoditomogem.pdf
    • http://parase.flycatchertravel.com/uploads/1/3/1/4/131437622/devetosi-rozarami-petoroju-taboxaledetalat.pdf
    • http://gekowafaw.sleddogsocietyofwales.co.uk/uploads/1/3/1/3/131382243/210860e112bfc1d.pdf
    • http://files.original-items.com/uploads/1/3/0/8/130874382/dedopov_fefuwoxojadadip.pdf
    • https://cdn.shopify.com/s/files/1/0436/5756/0217/files/37891173500.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/mtd_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2617/7438/files/18880500104.pdf
    • https://cdn.shopify.com/s/files/1/0433/5245/7369/files/28158546477.pdf
    • https://cdn.shopify.com/s/files/1/0454/2916/2152/files/inorganic_chemistry_notes_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/xikezuxamilugenureso.pdf
    • https://cdn.shopify.com/s/files/1/0431/9261/5073/files/71050701992.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3763/files/genetic_polymorphism_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/mumunokuluwutevuxotufosis.pdf
    • https://cdn.shopify.com/s/files/1/0429/2771/8567/files/favupe.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058cb.bin
b2359f35c3f958c605b28439d2c5dbe389853dc82fe643e5952f52164fa18f25
pdf-font-stream PDF embedded font (sfnt) at offset 0x58CB 5068 bytes
font_01_sfnt_off00006a19.bin
2ae0cbf7b914c69178d7cc11bae839bbcfd77b8cd96c0b9f8f6c0738b7b9cc83
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A19 10712 bytes