Malicious PDF — malware analysis report

Static analysis result for SHA-256 b923f54ca669e3b5…

MALICIOUS

PDF

39.2 KB Created: 2020-08-17 16:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4a30b3ee88f5f580c54fa9022693fe1 SHA-1: 6ea5b14f412123a7b679022e09f843b9703ca06a SHA-256: b923f54ca669e3b51385c5af20e7883a4aab058509ee2cc9f43fc31f30dcb16e
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a lab report. The primary link, https://ttraff.com/pify?keyword=half+subtractor+and+full+subtractor+lab+report, is flagged as malicious. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, some of which point to potentially suspicious domains.

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.com/pify?keyword=half+subtractor+and+full+subtractor+lab+report
    • http://nekowox.poorboyspaper.com/uploads/1/3/1/4/131483281/karawurefoxaxo_bigulugifak_tilix_fizota.pdf
    • http://files.kwebsterglass.com/uploads/1/3/2/6/132695551/1203027.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1575/files/comment_canaliser_sa_colre.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8424/files/88537584027.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/zosugupugepota.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/58979559331.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/bomojuboxanarezuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/rujemivofuzuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/amazing_grace_alto_sax_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/64418529662.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/26798459258.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5489/files/35875160219.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/vafijuwexivuguk.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/80246400268.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_off00005bdd.bin
b185ca78f7678817b686ebb59494b1fb81167cf846a12c9b6febbf4ed9c82088
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDD 5248 bytes
font_01_sfnt_off00006daf.bin
43c86509bce85360923bfbfcdec4fb2afe9b939352f6de40546a8ba93e0947fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAF 10060 bytes