Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1debffd26138db…

MALICIOUS

PDF

43.3 KB Authoring application: Karbon First seen: 2020-09-07
MD5: 2dc05cd194bed2774c1372c5787ab40e SHA-1: 793330a4dd210ebcabff73ef743e95604b9f0507 SHA-256: 4c1debffd26138db6b9a96a7277ae7835a9bb8bab5828c5dfafbfdff39596775
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.TtraffRobotInstall. No scripts were extracted, but the heuristic 'PDF_SEO_LINK_FARM' confirms the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://reinasporunacausa.com/uploads/1/3/0/5/130590778/zanusa_paraminifi.pdf In PDF document text
    • http://happyvids.com/uploads/1/3/0/6/130604105/kemogupegokevujimine.pdfIn PDF document text
    • http://3cfxinvestment.top/uploads/1/3/0/5/130539188/1871992.pdfIn PDF document text
    • http://danielgsinclair.com/uploads/1/3/0/5/130550655/8700423.pdfIn PDF document text
    • http://chicagonewconstructionlistings.com/uploads/1/3/0/8/130814731/sanupojir-lilizosepagol-lovuxububurop.pdfIn PDF document text
    • http://motherofbrumbies.com/uploads/1/3/0/6/130620604/8812530.pdfIn PDF document text
    • http://danicagoward.com/uploads/1/3/0/8/130814439/safekalatinowugo.pdfIn PDF document text
    • http://mysmartptt.com/uploads/1/3/0/6/130605426/sikixevituwapidiza.pdfIn PDF document text
    • http://thatsgoodthat.com/uploads/1/3/0/2/130273573/5941d76ec4.pdfIn PDF document text
    • http://art4peace.net/uploads/1/3/0/4/130483886/kemijabiwira.pdfIn PDF document text
    • http://sweetestdreams.org/uploads/1/3/0/4/130477131/130477131.html#aristotle+onassis+net+worth+2016In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECF 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
font_01_sfnt_off000042e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42E6 2696 bytes
SHA-256: b0a6a33381002d1c379ca931d660fe98df7a73518421c8b234b9dc16af60e95a
font_02_sfnt_off00004f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F60 9352 bytes
SHA-256: 7aa7643b7810dad3b9c0c19b71281b8b40664778931ce1bc5c036318c209c7e3