Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c3e7c4c59d94a7…

MALICIOUS

PDF

60.6 KB Authoring application: PDFBox
MD5: 0d99caf6bd93658aff4259be348235bd SHA-1: ddff1beb492567aaf402f44acfa65f43f6c072ec SHA-256: a2c3e7c4c59d94a761df8d2e6af821ab89eb1a383fa3c71490dca9266e05310f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, with ClamAV identifying it as Pdf.Phishing.TtraffRobotInstall-7605656-0. The document body, though heavily obfuscated, contains URLs that are consistent with the link farm heuristic, suggesting a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nefex.vipiski-besplatno2.icu/uploads/2020/01/27/6002104.pdf
    • http://willowdisplays.com/uploads/1/3/0/6/130605028/8597783.pdf
    • http://qualitynow.net/uploads/1/3/0/5/130588153/1cccc70af2eea.pdf
    • http://bruise-music.de/uploads/1/3/0/6/130604251/tanojoxifaz-sijosutup.pdf
    • http://bridgewist.com/uploads/1/3/0/2/130291539/9072895.pdf
    • http://puwizo.fastforcash.xyz/uploads/2020/01/29/fovetotodinup_widosotirone_ladive.pdf
    • http://tamax.videohabril.info/uploads/2020/01/28/dozise.pdf
    • https://fimezekawoviduz.weebly.com/uploads/1/3/0/2/130289340/vusixu-gugujavepav-vubob.pdf
    • https://fadarotujoxap.weebly.com/uploads/1/3/0/2/130289658/vefabasoxazovaxedike.pdf
    • http://xulewow.ugra-transfer.com/uploads/2020/01/29/d15dcbbf3.pdf
    • http://mvctk.com/uploads/1/3/0/2/130289393/7595641.pdf
    • https://wovaruzusibo.weebly.com/uploads/1/3/0/5/130590564/809719.pdf
    • http://zlz-fr.weebly.com/uploads/1/3/0/4/130435892/2095062.pdf
    • http://nagur.restaurantevalledeltietar.com/uploads/2020/01/27/7bfbe1d45e7985.pdf
    • http://nomadicescaperoom.com/uploads/1/3/0/5/130551132/4427669.pdf
    • http://fermelechampslibre.com/uploads/1/3/0/3/130323462/14a4c5571.pdf
    • http://sobglamour.com/uploads/1/3/0/6/130640072/kanelegid-fugigekulajibo-tuwifa.pdf
    • http://luxiwu.easygo.tech/uploads/2020/01/29/aa85170decf.pdf
    • http://phoenixbooks.org/uploads/1/3/0/6/130603815/lozawuzosimurok.pdf
    • https://likigapawizi.weebly.com/uploads/1/3/0/3/130313117/tuxaropaneriz_jakuziw.pdf
    • http://mysterycannabisclones.com/uploads/1/3/0/2/130289603/nigokomu.pdf
    • http://seve.ancientstudio.online/uploads/2020/01/29/puwekasuzo_dafatawuronan.pdf
    • http://zixedonoba.copyrightcontact-10000642147218.com/uploads/2020/01/28/72e6b72a6d1968c.pdf
    • http://tolhps.com/uploads/1/3/0/5/130551083/7427502.pdf
    • https://pibozedu.weebly.com/uploads/1/3/0/2/130270743/kozirafavabopu.pdf
    • http://nationalfootballcheerleadersalumni.org/uploads/1/3/0/6/130620700/130620700.html#adb+android+install+usb

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000016b9.bin
d4d2e8a47f38c4857562747bfa0e17844e2a9fb71379807cff28511af9b45cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9 11172 bytes
font_01_sfnt_off0000a6d5.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D5 16036 bytes