Malicious PDF — malware analysis report

Static analysis result for SHA-256 428b108582ee5eee…

MALICIOUS

PDF

53.8 KB Authoring application: Pdftk
MD5: 20ca83aa1d4fb57f11a26f1e1ffadcb6 SHA-1: 9a043bfd7143fdea39c5cca455885d2780bfa124 SHA-256: 428b108582ee5eee50d03ec629472105b7956acdd2470907d77286a9ee4bacb7
152 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents, a technique often used for SEO manipulation or to distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score support this assessment. The embedded URLs are the primary indicators of compromise, suggesting a traffic-generation or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://citizensfirstfinancialgroup.com/uploads/1/3/0/5/130552017/zegodakusitov_gijol_ferefefasil_nexodugi.pdf
    • http://mosaicsupervision.org/uploads/1/3/0/6/130604359/876291.pdf
    • http://grouperdate.com/uploads/1/3/0/5/130589268/biworobawopobesiv.pdf
    • http://3feetforpete.org/uploads/1/3/0/3/130323377/ximibaj_bivimas_zapomufuduto.pdf
    • http://labcharter-pto.com/uploads/1/3/0/5/130551475/vilon-kabonadi-dodotukodalara.pdf
    • http://moonmeart.com/uploads/1/3/0/5/130550955/vesuruxilejom_zivolexurureni_betejem_sujenow.pdf
    • http://policetrailer.com/uploads/1/3/0/2/130272524/130272524.html#chinese+zodiac+sign+compatibility+2018

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000118d.bin
5f5713f6fe60b43d3fd88b219c4529a6b3242771b66545171587f28272e45efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D 7916 bytes
font_01_sfnt_off00007428.bin
58b5e11ca88ac84a7b120f83927b9de497155f1d0006d81a95cb70430ef42053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7428 2748 bytes
font_02_sfnt_off00007d4d.bin
70bfa426820311df0651190a9483ade7cfd79ef55610394d7e79ab11dc19409e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4D 16172 bytes
font_03_sfnt_off000091f4.bin
8c8c99ec9a5a9027456c01e3668beb05f369f6ec0bb5d6c0fe6b1e94913c7254		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F4 4724 bytes

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