Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57277547c78cfc4…

MALICIOUS

PDF

42.0 KB Created: 2020-08-27 20:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f93aac69abdf5fbf6922e3a09416e464 SHA-1: a3bc32ded0bb24d717d2d49e696a4edb9e3da8ad SHA-256: c57277547c78cfc42d010b2a07fbed3668b330c338dea110de043c4c765b753b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=the+tempest+pdf+download'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs hosted on various domains, including Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, also contains the primary malicious URL, reinforcing the lure to click on external content.

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/pify?keyword=the+tempest+pdf+download
    • http://files.gidannodza.net/uploads/1/3/1/4/131407692/1572056.pdf
    • http://sakamebat.jambandpurist.com/uploads/1/3/0/9/130969162/vopeg.pdf
    • http://files.sandcastletreasures.com/uploads/1/3/2/8/132814958/xujuzobifenekosi.pdf
    • http://xunevifup.decoratingwithgrace.com/uploads/1/3/1/0/131070858/9edade8cf.pdf
    • https://cdn.shopify.com/s/files/1/0440/3222/9541/files/sexugefufemexevemujuwasi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/nolulesenileva.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/kusobogunegupi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6119/files/70129326896.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/pejofasiriziva.pdf
    • https://cdn.shopify.com/s/files/1/0439/2694/5947/files/89491849244.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sujaxitedidubabupopivup.pdf
    • https://cdn.shopify.com/s/files/1/0438/9856/8859/files/colosseum_tickets_guided_tour.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/minamofenavud.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/goxagaxosagemujifutujivij.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_off0000643d.bin
70d5d36c020eefd9d773419296a4bea34487802fc45c13e96c3d80862150e9ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x643D 5224 bytes
font_01_sfnt_off000075fc.bin
0b659af0eee627d732a4540e8a1cb1c55484ac69f4eb8fd80e0bf10c4486673a
pdf-font-stream PDF embedded font (sfnt) at offset 0x75FC 10300 bytes